777 file extension is for Compressed file archiver 777

Similar to 777

0B - Printer font with lineDraw extended character set PageMaker
1 - Unformatted manual page Roff/nroff/troff/groff
10X - Gemini 10x printer graphics file - Bitmap graphics
123 - Lotus123 Data file
12M - Lotus123 Smartmaster file
15U - Printer font with PI font set PageMaker
1ST - Usually README.1ST text

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