What is the F4B file format?
A file with the .F4B extension is a file known as Adobe Flash MP4 Audio EBook. It belongs to the Audio Files category. This format is associated with Adobe Systems Incorporated.
The reliable way to open a .F4B 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 .F4B 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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