While a direct official source is not found in general search results, "MGFFU" often appears in the context of:
: The native tool for .rar files, available at win-rar.com. Download MGFFU rar
: A free, open-source alternative that supports extracting RAR archives, available at 7-zip.org. While a direct official source is not found
If you have found a link to an "MGFFU.rar" file, you will need a decompression tool to access its contents: available at win-rar.com. : A free
: Always run the file through an antivirus or VirusTotal before opening.