What is the M4D file format?
A file with the .M4D extension is a file known as Sage MAS 90 Data. It belongs to the Misc Files category. This format is associated with The Sage Group plc.
The reliable way to open a .M4D 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 .M4D 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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