000-999 used to number old (backup) versions of files (for example, CONFIG.SYS when changed by an installation program); also used to number related data files for multiple users of a small-scale PC application
12M Lotus 123 97 Smart master file
123 Lotus 123 97 file
2GR and 3GR VGA Graphics driver/configuration files under Windows
386 A file for use in an 80386 or higher microprocessor
669 Composer 669, Unis Composer music mod file
#01 and higher A method of numbering picture files for a roll of film that has been scanned for computer presentation
$$$ Used by OS/2 to keep track of archived files
@@@ Screen files used in the installation and instruction on use of such applications as Microsoft Code view for C
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