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ReactOS Explorer is the default graphical shell that comes with ReactOS from version 0.2.0 forward. It is meant to be the equivalent of Windows Explorer on Windows operating systems. It is meant to be the equivalent of Windows Explorer on.

I'm trying to use React with Internet Explorer 9 but getting the following errors even trying to run something very barebones:

SCRIPT438: Object doesn't support property or method 'isArray'react-with-addons.js, line 4 character 317

SCRIPT438: Object doesn't support property or method 'create'JSXTransformer.js, line 4 character 326

I've read https://facebook.github.io/react/docs/working-with-the-browser.html, which says IE8 might have these issues, but no mention about IE9. Googling didn't really bring up any solutions either.

Still, I tried adding es5-shim/sham as suggested on that page. That results in a different error:

SCRIPT438: Object doesn't support property or method 'hasAttribute'es5-shim.min.js, line 6 character 4143

Has anyone encountered these errors before in IE9 or otherwise?

Thanks for the help!

The full code I'm trying to run is:

2 Answers

General You need to include the specified poly fills for ES5 features (as you've noticed): https://facebook.github.io/react/docs/react-dom.html#browser-support You may also need HTMl5 shiv in addition to the the poly-fills you've provided.

More specifically though the problem is probably not with poly fills but with the document mode IE9 is running in. You want to make sure that you are setting the correct document mode in your HTML file so IE, knows which version to target. Otherwise even though you are using IE9 it may be targeting IE7 which is no good.

In index.js file you have to add polyfill. These imports should be in the first of your import.

Now open in ur ie it works.

Before import you have to install react-app-polyfill.

link reference:https://www.npmjs.com/package/react-app-polyfill

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If you wish Windows was open source, you should look into ReactOS!

Microsoft has made many strides towards being more open. This trend ranges from participation in industry groups to interoperability of its files and applications. Heck, it’s even released many of its own tools and applications as open source.

But one area where it’s yet to budge is the Windows operating system (OS). As the combination of Windows and Office provide a large portion of Microsoft’s yearly revenue, it may be a while until we can download the OS code for ourselves. As a result, some intrepid community members have taken it upon themselves to try to build their own Windows from the ground up.

In this article, we’ll take a look at what ReactOS is, how to install it, and how it handles some existing Windows applications.

What Is ReactOS, Anyway?

ReactOS is an attempt to build an open-source operating system that mimics Windows. This doesn’t just mean looking like WindowsHow to Make Windows 10 Look Like Windows XP, 7, or 8.1How to Make Windows 10 Look Like Windows XP, 7, or 8.1The tough part about upgrading Windows is that everything changes. Here's how to turn Windows 10 into a Windows XP, 7, or 8.1 look-alike to make the move easier -- for yourself or a friend.Read More, although it does (well, older versions in any case). But it goes deeper than that.

The main goal of the project is to build an operating system that will run any Windows applicationHow to Use Vineyard to Run Windows Apps on LinuxHow to Use Vineyard to Run Windows Apps on LinuxVineyard makes it easy to install and run Windows apps on Linux with Wine. Find out how to use it and get your favorite Windows software running in minutes!Read More you throw at it.

This is an immense undertaking. At a very high level, an operating system is made up of the following components:

• A kernel, which translates between software and hardware.
• Basic software libraries that provide common functions like writing a file to disk.
• Services that run in the background. The Print Spooler is an example of this, as it waits for other programs to send something to the printer and manages that exchange.
• Applications that use these components. This includes not only user-facing apps like Word or Chrome, but also system applications. For example, explorer.exe is a program that not only browses files (user-facing), but also provides the desktop, Taskbar, and Start Menu.

The job before the ReactOS project is to provide a set of libraries, services, and (system) applications that are compatible with the ones Microsoft hasOne Size Doesn't Fit All: Why Software Isn't Universally CompatibleOne Size Doesn't Fit All: Why Software Isn't Universally CompatibleSoftware is the same on any operating system, right? Wrong. It might look the same, and function similarly, but it is different behind the scenes.Read More. In addition, these software components will normally make system calls directly to the kernel on behalf of user-facing programs. So ReactOS also needs to intercept these, process them, and reply, all while the app is none the wiser.

Hopefully, you have an idea of the scope of what the ReactOS developers are trying to do. And that’s why, based on the current state of the project, there are some things that work and some that don’t. In the below sections we’ll walk through the installation process in a virtual machineWhat Is a Virtual Machine? Everything You Need to KnowWhat Is a Virtual Machine? Everything You Need to KnowVirtual machines allow you to run other operating systems on your current computer. Here's what you should know about them.Read More. Then we’ll install three applications to see how they perform: one basic, one intermediate, and one complex.

How to Install ReactOS

The installation of ReactOS is very (very) similar to Windows. If you’ve ever installed Windows from scratch, such as on a PC you built yourself, you’ll be right at home. The initial stages are in “screen of death” blue, while the finishing touches use familiar-looking (if dated) dialogs.

If you’d like to follow along, start off by installing VirtualBox for your OS. Then create a virtual machine with the settings as shown in the below picture. Most of these are default settings, with the exception of the RAM (1GB) and hard disk space (10GB), which although low should be plenty for this lean system. If all this sounds like gibberish to you, take a look at our guide to VirtualBoxHow to Use VirtualBox: User's GuideHow to Use VirtualBox: User's GuideWith VirtualBox you can easily install and test multiple operating systems. We'll show you how to set up Windows 10 and Ubuntu Linux as a virtual machine.Read More to see what it’s all about.

Step 1: Installer Language

The first screen will ask you to select the language to use during the install process. Here you can see the lovely blue screens common to Windows installations. On this and the screens to follow, you can navigate with the arrow keys, use Enter to make a selection, and perform other actions with keys listed in the bottom bar.

Steps 2-3: Welcome and Warning

Here’s a nice message welcoming you to ReactOS, as well as a note that it’s still under development.

Steps 4-5: Devices and Storage

You’re safe to accept the default values for the devices, they’re all standard components that VirtualBox emulates.

On the next screen, the virtual disk you created for your VM should appear. You can tell if the size of the “C: drive” matches what you’d told VirtualBox to allocate for this VM. Unless you need a fancy partition scheme, you can just hit Enter here.

Step 6: Confirmation

On this final screen, select the middle option. It will completely format your disk, which you’ll want whether the VM is brand-spanking new, or you’re recycling an old virtual disk file.

Hit Enter on the next screen again to confirm.

Step 7: Formatting

Depending on the size of your virtual disk, the formatting process may take some time.

Step 8: Install OS

Next, the installer will copy the OS files to your virtual disk.

Step 9: Install Bootloader

Lastly, the installer will set up the VM’s bootloader to run ReactOS when you start it. Choose the first option here, which will install it to both the virtual disk as a whole as well as the C: partition specifically. A final screen will inform you that you’ll reboot your machine. Say goodbye to that awesome electric blue.

How to Set Up ReactOS

You should now boot into the ReactOS itself. If you’re a user of a certain age, the styling you see should look familiar. Now a wizard will appear to help you set up some aspects of the system:

1. A welcome screen.
2. Acknowledgements, particularly to the open source project that ReactOS contains.
3. Language Settings, including for the system (date/time, currency, and other formats) and for the keyboard (e.g. U.S. layout), shown in the above image.
4. An option to add your name, and your company’s name.
5. A name for your machine, and the password for the administrator accountWindows Administrator Account: Everything You Need to KnowWindows Administrator Account: Everything You Need to KnowStarting with Windows Vista, the built-in Windows Administrator account is disabled by default. You can enable it, but do so at your own risk! We show you how.Read More.
6. Setting the date, time, and time zone.
7. Selecting a theme. ReactOS contains two out of the box: Lautus, a dark theme, and Classic (which looks just like you’d expect), shown in the below image.
8. Network settings.
9. Indicating whether the ReactOS machine will be part of an (ad-hoc) workgroup or a company domainHome Network Tip: How to Share Files & Folders Between Windows User AccountsHome Network Tip: How to Share Files & Folders Between Windows User AccountsSometimes computer can be physically very close together, but seem miles apart when you try transfer a file. Use this guide to help you fling files from PC to PC with the greatest of ease.Read More.
10. A final progress screen while the OS works in the background.

Reactos Source

Once all this is complete, your desktop will be ready for use. If you’re a regular Windows user, everything here should be very familiar. The “Start” menu, taskbar, system tray, and desktop icons all look exactly like Redmond’s OS. It all looks the same, but how well does it work?

Installing Windows Programs in ReactOS

We’ll be selecting three applications for use in this experiment, as follows:

• Text editorThe 6 Best Windows Notepad AlternativesThe 6 Best Windows Notepad AlternativesWindows Notepad is too simple, but Microsoft Office is overkill? If you're looking for a Notepad replacement, here are the leading alternatives. One will be perfect for you.Read More. It’s one of the most basic computer tools there is, and ReactOS does have its own clones of both Notepad and Wordpad, just like Windows. Nevertheless, we’ll try to install PSPad, an open source text editor.
• Music playerThe 5 Best Free Music Players for WindowsThe 5 Best Free Music Players for WindowsDownloading music still has its benefits. For one, you can play music even when you don't have internet access. But which music player should you use? Find the best free music players here.Read More. QMMP is cross-platform and looks like WinAmp, so it seems like a fine choice. But multimedia applications need to interact with various OS internals, so it represents something a little more complicated than a text editor.
• Web browserThe Best Web Browsers for WindowsThe Best Web Browsers for WindowsWhat is your default web browser? Even though we're spoiled for choice, the majority of us stick to the tried and tested major players. What are better alternatives for resource use, speed, and security?Read More. We’re looking for something complex here, why not go for it? Let’s try to install the latest Chrome.

Note: While the initial instructions listed 1GB of RAM to the ReactOS virtual machine, based on the selection of Chrome, I upped this to 2GB before doing the installations.

Reactos Reviews

The following sections will detail how successful (or not) the install and execution of these programs were.

Installing and Running PSPad

After downloading an installer from the project’s website, a simple double-click kicked things off.

The install completed without issue, and the installer launched the application. Some rudimentary testing (entering text and saving the file) went off without a hitch. One glitch I did notice was that the Minimize button on the title bar didn’t work. Maximize did work, toggling it back and forth between the size shown in the below image and full-size. But Minimize didn’t, while it did work on other windows such as the file manager.

Overall it appears at first blush to be largely functional. So as our representative of a “basic” application, PSPad passes the test.

Note: ReactOS has an Application Manager, which more resembles the various package managers of the open source world than Windows’ “Programs and Features.” This is a sort of software repository from which users can select and install applications for ReactOS, much like the Windows Store. A pleasant surprise was that PSPad showed up as installed in this tool, even though we installed it manually. What’s more, the Application Manager has a (slightly older) version of PSPad for installation. It also installed correctly and even picked up the session I’d opened in the newer version.

Installing and Running QMMP

QMMP is also available for download from its website; just scroll down to the bottom of the Downloads page and look for the link for “Binary packages for Windows.” Pick up the installer for the most recent version, and double-click to run.

Things went downhill though once the application started up. It allowed me to start the application and add a song to the playlist, but it wouldn’t play. At this point, I noticed that the sound driver wasn’t set up properly for the VM, but even after doing so and confirming it, the app wouldn’t play an MP3 file. In fact, ReactOS began freezing when I tried to uninstall QMMP to re-install it. A fresh install of ReactOS, where I made sure to install the audio driver first, didn’t even solve the issue.

For this “moderate” application, we can evaluate it as not passing. Although it did install and start up, it didn’t actually perform its core function.

Note: Like PSPad, QMMP is also available from the ReactOS Application Manager. Installing this (again, older) version did work, as shown in the above image.

Installing and Running Chrome

Now for the coup de grace: the Chrome web browser. If you can get this installed and running on your machine, you suddenly have a wide variety of tools at your disposal. This ranges from desktop email to audio players (check out our guide to Spotify) to productivity tools (Google Docs or Office Online). But its ability to run all this great web-based software means it’s a complex beast under the hood. Can ReactOS handle it?

Unfortunately, no. At least running the standard ChromeSetup.exe file was unsuccessful. The installer wasn’t even able to connect to the internet to download the browser itself, which doesn’t bode well for Chrome’s ability to surf the web on ReactOS.

Note: Although Chrome isn’t an option, at least not without applying some elbow grease to get it installed, Firefox is! It’s available from the Application Manager and runs well. Though the version was a bit older (v.45.0.1), it didn’t have any trouble opening the draft of this article in Google Docs after I’d logged into Gmail, as shown in the below image.

Reactos Explorer On Windows 10

Should You Use ReactOS?

It depends. If you’re already a Windows user? No, not for any reason, unless it’s just curiosity. If you’re a Mac or Linux user? It might be useful to run the odd Windows application you need by running it in VirtualBox. Basically, if you’re in a situation where Wine won’t run something you want, and you don’t want to pony up for a Windows license. Just keep in mind its in-progress state and don’t make any big bets (e.g. don’t rely on it for any mission-critical programs without extensive testing).

That said, if you have some older hardware that doesn’t have an OS, and you need one, ReactOS might be a viable option. You should plan on sticking to what’s available from the Application Manager, which is not as bad as it sounds. While some of the manually-installed apps didn’t work out, ReactOS went “three for three” with Application Center installs.

In addition to the above utilities and Firefox, there are some heavy-hitting applications available. Like LibreOffice. GIMP, Inkscape, and Scribus for graphics/publishing. GnuCash for finances. VLC for video. There’s even a demo version of Diablo II. Not too shabby for a group of community developers taking on Microsoft.

All told, you’d probably be better off with a Linux distribution in terms of software updates and general capability. But if you’ve got an older machine and a user that just can’t grok another operating system? In that case, even in its current alpha state, ReactOS is definitely worth a look.

Do you think ReactOS a worthwhile endeavor? Wouldn’t a completely free and open-source Windows-compatible OS be awesome? Let us know in below in the comments if you have any opinions!

Explore more about: Install Software, Open Source.

1. For me, the big question is will it run Office, especially unsupported versions like 2007 or 2003.

   Running those older versions in a VM in ReactOS would be a great help.

   Do you know if anyone has tried to install and run any version of Office in React.

   • Looks like 2003 works not perfectly, but actually pretty OK.

     Is it all that vital, though, when LibreOffice works already?

2. My biggest question (after will it run the program I want) is how does the security compare to actual Windows products; is it more resistant to malware or is it compatible enough to suffer from the same attacks?

3. Hey! I don't mind with the 'classic' Windows look as long as it is able to run any Windows software and games. Unfortunately the development of ReactOS is too slow, it's almost comparable to GNU/Hurd. To a certain degree, I agree that ReactOS devs should have designed its own UI instead of mimicking the classic look but I think their priority is to make the core work before moving to the eye candy elements.

   • 'ReactOS devs should have designed its own UI instead of mimicking the classic look'
     Linux and BSD devs designed many UIs that are different from the 'classic look' but all you hear is 'Linux sucks! It does not look or feel like Windows. Boo hoo hoo'

4. ReactOS is in a perpetual state of alpha or beta. They have not come out with even one final release. ReactOS is falling further and further behind Windows in features and look and feel. I gave up Windows more than 10 years ago. Even if I suddenly developed the urge to go back, why would I want to go back to something that looks and works like W2K or XP?!

   • They moved slow for a few years, and then went stagnant for a long time, (for example the 18 months after 0.3.17 in Nov 2014, but since 0.4.0 in Feb 2016, they've sped up and kept to a regular schedule of a new release every 3 months

     0.5 is coming this year, which will finally move ReactOS from alpha to beta working state, where it will be essentially feature complete and the focus shifts to bug hunting and polishing.

5. The main goal of the project is to build an operating system that will run any Windows application you throw at it.

   And yet... they make it a point to duplicate all the annoyances too. Like small little configuration windows that don't expand, clumsy administration section, networking configs that are out of 1993, a rudimentary taskbar, no built-in search/filter within start menu...

   I like what they're trying to achieve but they should find a way of being inspired by something like Cinnamon (Mint/Linux) as a front-end base. By the time they hit 1.0, it's going to feel like running win3.x. Quite frankly, it already feels that way (I've run it on bare metal a couple of times).

   I don't ever intend to return to Microsoft's spyware OS but ReactOS is a different beast altogether. I especially like the shared work between the different groups bringing Windows Application compatibility to various OSes (especially how this effects WINE).

6. Did you try the Chrome enterprise .msi installer? I don't believe it goes out to the internet to download the rest of the installer.