Open SUB File
File extension SUB most commonly stands for SUBtitles. These files contain subtitles that accompany some video stream is either distributed via internet or by cable television. File extension SUB is less commonly used by many other applications that are mostly outdated.
How to open SUB files
Typical SUB application file locations:
C:\Windows\system32\NOTEPAD.EXE %1
Frequently associated Windows objects:
sub_auto_file