How to open R21 file extension?

The author of advice: Mr Brankiewicz

R21 files are incessantly popular. However, a file name containing R21 file extension is problematic for some of the users. They have problems with correct opening of a file with R21 extension. However, it should be remembered that R21 file extension can match one or more types of files. The most popular is Split Multi-volume RAR Compressed File Archive (part 23) but if there are others, you will find information concerning them below.

So, it is worth looking close at the problem concerning R21 files and search for its solution.

A list of programs supporting files types with R21 extension can be found below. Applications are sorted according to appropriate operational systems and their popularity.

  • Split Multi-volume RAR Compressed File Archive (part 23)

    .r21 file extension

    Category: Archive Files

    OS Software
    Windows WinRAR WinRAR
    Smith Micro StuffIt Deluxe 2010 Smith Micro StuffIt Deluxe 2010
    Bitberry BitZipper Bitberry BitZipper
    Corel WinZip 15 Pro Corel WinZip 15 Pro
    Whirling Dervishes Alpha ZIP Whirling Dervishes Alpha ZIP
    7-Zip 7-Zip
    Zipeg Zipeg
    MAC OS UnRarX UnRarX
    Smith Micro StuffIt Deluxe 2011 Smith Micro StuffIt Deluxe 2011
    Dare to be Creative Archiver Dare to be Creative Archiver
    Zipeg Zipeg
    Linux unrar unrar

How to check if a file we want to open is not infected by malware or viruses?

  • Download Malware/viruses removal tool from R21 files in the Windows system.
  • Click “Start scanning” and wait until the programme performs the scanning process on your computer.

What are the reasons of errors concerning R21 extension of files?

The problem that often causes damage concerning R21 extension are Windows system registry errors. That is why, in the first place it is recommended to:

  • Scan computer in order to identify, repair and open the R21 file
  • Check system registry from the angle of hidden errors
  • Repair file’s associations with programs in the system registry

If you are not sure if the above problems concern you, you should consider other frequent irregularities:

  • You do not have an appropriate application installed that supports R21 file extension
  • R21 file is corrupted
  • The application’s version necessary to open the file is not correct
  • The file is not assigned to an appropriate program

Solving problems with R21 files


If R21 file does not open, firstly, it is worth using files associations built in the Windows system with application that can support them. In order to do it, you should double-click a R21 file icon. A list of programs that probably support such a file will appear. It is enough to choose one of them so that Windows would open a given extension with it. Incorrect file’s association will result in Windows trying to open R21 file with a wrong program all the time even if there is an appropriate application supporting this format on a drive. In this case, it is necessary to perform the above mentioned registry scanning and associations’ repair.

If associations are correct and Windows still cannot open the file, most probably the computer does not have appropriate software supporting files with name containing R21 in their extension. The solution to this problem is very simple. You should buy or download a free (if they exist) application that will allow you to open, browse and edit R21 format (You can also try to find more informations on FileInfo). It is no risk because many paid programs have free test versions enabling to check their functionality.

Do you have extra information about a R21 file? [ Add information about a R21 file ]

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