File names in MS dos are used as identifiers and dies not exceed 8 characters.
The extension show which file type the file is and don't exceed three characters.
Com shows all command files.
Bat shows all batch files.
Fat shows all data files.
Bak shows all back up files.
Doc shows all document files.
Txt shows all text files.
Xls shows all excel files.
Sys shows all system files.
PPT shows all power point files.
A period is used to separate extension from file name.
Introducing a computer windows '95
💻 It was the first use guitar and dos. Introducing a computer win '95.
ms dos is line command os.
