1.m3u file is a music list file, which supports most audio players and can also be opened with Notepad.

Call dynamic connection library requires system call.

3.dat database file, which requires system call; There is also vcd format, which is supported by most video players.

4.sig digital signature file, which can be opened with notepad.

5.sav game archive file, which can be opened with notepad.

6.mjz game language file (non-universal) cannot be opened.

7.apt Protel program special format (not universal).

8. A special compressed package format adopted by 8.PakQuake series games cannot be opened.

9.lst slide file. (non-dedicated)