COM extension - meaning and definition. What is COM extension
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What (who) is COM extension - definition

FILE FORMAT
COM files; .com (file extension); .COM; DOS COM executable; PATHEXT; CP/M COM executable; COM file (CP/M); COM file (DOS); .COM file; .COM files; COM program; COM executable; .COM (file extension); COM file (SCP); COM file (MSX-DOS)
  • A number of COM files in [[IBM PC DOS]] 1.0

.com         
com
Group extension         
  • Figure 1
GROUP FOR WHICH A GIVEN GROUP IS A NORMAL SUBGROUP
Extension problem; Extension (algebra); Split extension; Extension of a group; Central extension (mathematics)
In mathematics, a group extension is a general means of describing a group in terms of a particular normal subgroup and quotient group. If Q and N are two groups, then G is an extension of Q by N if there is a short exact sequence
Extension (metaphysics)         
THE PROPERTY OF STRETCHING OUT OR TAKING UP SPACE
Physical extension
In metaphysics, extension signifies both 'stretching out' (Latin: extensio) as well as later 'taking up space', and most recently, spreading one's internal mental cognition into the external world.

Wikipedia

COM file

A COM file is a type of simple executable file. On the Digital Equipment Corporation (DEC) VAX 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 Digital Research's 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 DOS. Even when complemented by the more general EXE file format for executables, the compact COM files remained viable and frequently used under DOS.

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 malware writers.

Examples of use of COM extension
1. Clearly, both airtel.com and bhartiairtel.com were already taken, because Bharti has registered all other domain names under the .com extension including bhartiteleventures.com.