What is the A09 file format?
A file with the .A09 extension is a file known as Split Multi-volume ARJ Compressed File Archive (part 11). This format is associated with ARJ Software, Inc..
The reliable way to open a .A09 file is with software that recognises this exact format, rather than guessing from the file name. If you are not sure what created a file, our file identifier can read its first bytes and name the real format, even when the file has been renamed.
We are still gathering the list of programs that open .A09 files. A fully verified, hand-written description of this format is being prepared; until then, the details on this page are drawn directly from our database.
Format details
in a nutshellFULL NAMESplit Multi-volume ARJ Compressed File Archive (part 11)
DEVELOPERARJ Software, Inc.
CATEGORYMisc Files
Community Q&A
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