since 2000
Opening an R21 File
The R21 file type is primarily associated with WinRAR.
What is an R21 file?
R21 files mostly belong to WinRAR by RarLab. R21 files are part of compressed archives created by WinRar, a compression software.
- Main Usage: The compressed archive created through WinRar is stored as an R0 file. This may be a standalone archive file, in which case, all the data is contained within the single R0 file. Alternatively, it may be part of a multi-volume archive, where the contents of the archive are split across numerous files. Other parts of the multi-volume archive would use the extensions R01, R02 and so on, or R20, R21, R22, etc. The purpose of this compressed archive format is to group files into a singular archive and to reduce the disk space required to store this data. Splitting the data using a multi-volume archive can be used to facilitate sending this data over protocols which impose limits on individual file size, such as email. This format is similar to other multi-volume compressed archives, such as the C00 extension, which is used by WinACE. The C00 format uses a similar naming convention to the R0 format, as both increment the digit by 1 for each part of the archive.
How to open R21 files
You need a suitable software like WinRAR to open an R21 file. You need a suitable software like WinRAR from RarLab to open an R21 file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your R21 file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a R21 file directly in the browser:. Just drag the file onto this browser window and drop it.
Online R21 Text Viewer
or drag and drop it here
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Unable to Open a .R21 File? Quick Solutions:
Because .R21 files can originate from various programs, they aren't universally openable with a single application.
- Identify the Source: If you received a large batch of files or downloaded a massive archive, it is likely part 21 of a split compressed file.
- Check the Header: Open the file in a hex viewer to inspect its first bytes:
Rar!indicates a standard WinRAR compressed archive.- Readable text or XML suggests a misnamed document.
- Use the Original Software: You usually need the original program to open it; try RarLab WinRAR, 7-Zip, or PeaZip, or ask the sender if uncertain.
- Use this Webpage: Drag and drop your .R21 file into our viewer above to detect its exact format, extract readable metadata, and preview.
Technical Data for R21 File Extension
The following listing is compiled from the database produced by the 'Associate This!' program, selected data from the main FILExt database and file extension information submitted by users.
ProgramID: WinRAR, FileType: WinRAR archive, AppName: WinRAR archiver
EXEFile: WinRAR.exe
EXEFile: WinRAR.exe
ProgramID: PowerDesk.Archive
EXEFile: Y:\Ontrack\PowerDesk\PDExplo.exe %1
EXEFile: Y:\Ontrack\PowerDesk\PDExplo.exe %1
ProgramID: WinRAR
EXEFile: %ProgramFiles%\WinRAR\WinRAR.exe %1
EXEFile: %ProgramFiles%\WinRAR\WinRAR.exe %1
ProgramID: WinRAR
EXEFile: C:\WinRAR\WinRAR.exe %1
EXEFile: C:\WinRAR\WinRAR.exe %1
ProgramID: WinRAR
EXEFile: E:\WinRar 3.4\WinRAR.exe %1
EXEFile: E:\WinRar 3.4\WinRAR.exe %1
ProgramID: WinRAR
EXEFile: %ProgramFiles%\WinRar 8\WinRar 8 beta\WinRAR.exe %1
EXEFile: %ProgramFiles%\WinRar 8\WinRar 8 beta\WinRAR.exe %1
ProgramID: WinRAR
EXEFile: %ProgramFiles%\Utilities\WinRAR\WinRAR.exe %1
EXEFile: %ProgramFiles%\Utilities\WinRAR\WinRAR.exe %1
ProgramID: WinZip
EXEFile: %ProgramFiles%\WINZIP\winzip32.exe
EXEFile: %ProgramFiles%\WINZIP\winzip32.exe
ProgramID: Rar-Archiv
EXEFile: %ProgramFiles%\WinAce\WinAce.exe
EXEFile: %ProgramFiles%\WinAce\WinAce.exe
an r21 part 21 of split file is a special file format by RarLab and should only be edited and saved with the appropriate software.
How to solve problems with R21 files
- Associate the R21 file extension with the correct application.
- Update your software that should actually open part 21 of split files. Because only the current version supports the latest R21 file format. Search, therefore, e.g. on the RarLab manufacturer website after an available WinRAR update.
- To make sure that your R21 file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
- Click here to open your .R21 file online - secure, fast, and no downloads needed.