Language021
Split file or Compressed file from a multi-volume archive (part 21)
File type: Archive and compressed file
A 021 file extension is related to split file or compressed file from a multi-volume archive (part 21).
Found 2 different file type records with the same 021 filename suffix.
What is 021 file?
File type category:
Archive and compressed file
Date updated: July 19, 2025
The 021 file extension is generally associated with split files. A part of larger file split using splitter software, such us HJSplit, WellTek 001 File Joiner & Splitter, SplitJoin or File Managers, such as Total Commander. It is also associated with several archivers or compression tools, which are using, or did use in the past, the 021 file extension for its multi-volume files or archives, such as Winrar (see part21.rar) or 7-Zip (see 7z.021).
In case of split files, you will need to merge them first with the use of the splitting/joining software tool, before you can open or work with them. If the files are compressed multi-volume archives, you will have to extract the first one and it will automatically continue to extract all the parts. In either case, you will need ALL the parts to access the original content.
How to open 021 file?
To open or use the split file, you will need to first joint the file with the original splitting software. In case of multi-volume archive, just put all the parts in same directory and extract the first part.
How to convert 021 file?
In order to convert the original split file to something else, you will need to merge it first using the original splitting tool. In case of multi-volume archive, its not possible to convert only one part of it. Only complete archive can be converted in to another archive or compression format. The easiest way how to convert complete multi-volume archive is to decompress the archive with the use of supported archiving or compression tool and repack the content with another compression or archive application of your choice.
Suggested software to open 021 file:
Associated software actions with the 021 file
Software applications that can open 021 files:
WinRAR (Microsoft Windows)
7-zip (Microsoft Windows)
HJSplit (Microsoft Windows)
Split File Shell Extension (Microsoft Windows)
Total Commander (Microsoft Windows)
Software apps that create 021 files:
7-zip (Microsoft Windows)
HJSplit (Microsoft Windows)
Split File Shell Extension (Microsoft Windows)
Total Commander (Microsoft Windows)
Software apps that extract 021 files:
WinRAR (Microsoft Windows)
7-zip (Microsoft Windows)
Winfunktion Mathematic v8.0 Julia fractal
File type category:
Various data file
Date updated: January 16, 2019
The 021 file extension is associated with Winfunktion Mathematik v8.0. An old german math program released in 1998.
The 021 files are used for julia set mathematic fractals. The current and latest version of Winfunktion Mathematik is 22. There are no information available if the 021 files are still used in the newest versions for julia set fractals.
How to open 021 file?
Use Winfunktion Mathematic to open *.021 files.
Suggested software to open 021 file:
Associated software actions with the 021 file
Software applications that can open 021 files:
Winfunktion Mathematik Plus (Microsoft Windows)
Software apps that create 021 files:
Winfunktion Mathematik Plus (Microsoft Windows)
Software applications that handle other tasks involving 021 files:
Winfunktion Mathematik Plus (Microsoft Windows)