In these documents, it is not an actual file. It is a snippet of Uuencoded data —a form of binary-to-text encoding used to transmit files or signatures within the plain text of a legal filing.

In other contexts, "fgf" is often used as a shorthand for various niche terms, leading to the creation of .7z archives by individual users or small communities:

"FGF" sometimes refers to FlightGear Files , where users might bundle custom aircraft or scenery into a fgf.7z archive for sharing on forums.