What is the W40 file format?
A file with the .W40 extension is a file known as Windows 95 Backup Format. This format is associated with N/A.
The reliable way to open a .W40 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 .W40 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
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