R21 File Extension

What is R21 file?

Full format name of files that use R21 extension is WinRAR Split Archive Part 21. WinRAR Split Archive Part 21 specification was created by Eugene Roshal. R21 file format is compatible with software that can be installed on Linux, Mac OS, Windows system platform. R21 file format, along with 236 other file formats, belongs to the Compressed Files category. The most popular program for handling R21 files is WinRAR, but users can choose among 6 different programs that support this file format. WinRAR software was developed by win.rar GmbH, and on its official website you may find more information about R21 files or the WinRAR software program.

Programs which support R21 file extension

The list that follows enumerates programs compatible with R21 files, divided into 3 categories based on operating system on which they are available. R21 files can be encountered on all system platforms, including mobile, yet there is no guarantee each will properly support such files.

How to open file with R21 extension?

Being unable to open files with R21 extension can be have various origins. Fortunately, most common problems with R21 files can be solved without in-depth IT knowledge, and most importantly, in a matter of minutes. The list below will guide you through the process of addressing the encountered problem.

Step 1. Get the WinRAR

The main and most frequent cause precluding users form opening R21 files is that no program that can handle R21 files is installed on user’s system. The most obvious solution is to download and install WinRAR or one to the listed programs: WinZip, 7-Zip, Zipeg. Above you will find a complete listing of programs that support R21 files, classified according to system platforms for which they are available. One of the most risk-free method of downloading software is using links provided by official distributors. Visit WinRAR website and download the installer.

Step 2. Verify the you have the latest version of WinRAR

If the problems with opening R21 files still occur even after installing WinRAR, it is possible that you have an outdated version of the software. Check the developer’s website whether a newer version of WinRAR is available. Sometimes software developers introduce new formats in place of that already supports along with newer versions of their applications. The reason that WinRAR cannot handle files with R21 may be that the software is outdated. The most recent version of WinRAR is backward compatible and can handle file formats supported by older versions of the software.

Step 3. Associate WinRAR Split Archive Part 21 files with WinRAR

If the issue has not been solved in the previous step, you should associate R21 files with latest version of WinRAR you have installed on your device. The process of associating file formats with default application may differ in details depending on platform, but the basic procedure is very similar.

The procedure to change the default program in Windows

• Choose the Open with entry from the file menu accessed by right-mouse clicking on the R21 file
• Select Choose another app → More apps
• To finalize the process, select Look for another app on this PC entry and using the file explorer select the WinRAR installation folder. Confirm by checking Always use this app to open R21 files box and clicking OK button.

The procedure to change the default program in Mac OS

• Right-click the R21 file and select Information
• Find the Open with option – click the title if its hidden
• Select WinRAR and click Change for all...
• If you followed the previous steps a message should appear: This change will be applied to all files with R21 extension. Next, click the Continue button to finalize the process.

Step 4. Verify that the R21 is not faulty

You closely followed the steps listed in points 1-3, but the problem is still present? You should check whether the file is a proper R21 file. Being unable to access the file can be related to various issues.

1. Verify that the R21 in question is not infected with a computer virus

If the R21 is indeed infected, it is possible that the malware is blocking it from opening. Immediately scan the file using an antivirus tool or scan the whole system to ensure the whole system is safe. If the R21 file is indeed infected follow the instructions below.

2. Ensure the file with R21 extension is complete and error-free

Did you receive the R21 file in question from a different person? Ask him/her to send it one more time. The file might have been copied erroneously and the data lost integrity, which precludes from accessing the file. When downloading the file with R21 extension from the internet an error may occurred resulting in incomplete file. Try downloading the file again.

3. Verify whether your account has administrative rights

Sometimes in order to access files user need to have administrative privileges. Switch to an account that has required privileges and try opening the WinRAR Split Archive Part 21 file again.

4. Check whether your system can handle WinRAR

If the systems has insufficient resources to open R21 files, try closing all currently running applications and try again.

5. Ensure that you have the latest drivers and system updates and patches installed

Regularly updated system, drivers, and programs keep your computer secure. This may also prevent problems with WinRAR Split Archive Part 21 files. Outdated drivers or software may have caused the inability to use a peripheral device needed to handle R21 files.

Do you want to help?

If you have additional information about the R21 file, we will be grateful if you share it with our users. To do this, use the form here and send us your information on R21 file.