--- File

A file with the .--- extension is a file known as Microsoft Backup File Set. This format is associated with Microsoft Corporation.

The reliable way to open a .--- 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 .--- 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.