Having problems opening a 21D file?

We have programs that open, view or play your 21D files.

Opening 21D files

Did your computer fail to open a 21D file? We explain what 21D files are and recommend software that we know can open or convert your 21D files.

What is a 21D file?

Every day thousands of users submit information to us about which programs they use to open specific types of files.

While we do not yet have a description of the 21D file format and what it is normally used for, we do know which programs are known to open these files. See the list of programs recommended by our users below.

We are constantly working on adding more file type descriptions to the site - the current count exceeds thousand by far, and more information about 21D files will hopefully be added soon.

Software that will open, convert or fix 21D files

Try a universal file viewer

Try a universal file viewer like Free File Viewer. It can open over 200 different types of files - and most likely yours too. Download Free File Viewer here.

About File Extension 21D

File.org aims to be the go-to resource for file type- and related software information. We spend countless hours researching various file formats and software that can open, convert, create or otherwise work with those files.

If you have additional information about the 21D file format or software that uses files with the 21D suffix, please do get in touch - we would love hearing from you.