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A COM file is a type of simple executable file . On the Digital Equipment operating systems of the 1970s, .COM was used as a filename extension for text files containing commands to be issued to the operating system (similar to a batch file ). With the introduction of CP/M (a microcomputer operating system), the type of files commonly associated with COM extension changed to that of executable files. This convention was later carried over to MS-DOS . Even when complemented by the more general .exe file form
The .COM file name extension has no relation to the .com (for "commercial") top-level Internet domain name. However, this similarity in name has been exploited by malicious computer virus writers.
The COM format is the original binary executable format used in CP/M and MS-DOS . It is very simple; it has no header (with the exception of CP/M 3 files), and contains no standard metadata , only code and data. This simplicity exacts a price: the binary has a maximum size of 65,280 (FF00 h ) bytes (256 bytes short of 64 KB) and stores all its code and data in one segment.