Notes about the COM file extension:
To open this file type, a required software must be installed. Without it you only see a Windows message "The following file cannot be opened
" (Windows 7) or "How do you want to open this file?
" (Windows 10) if you double-click the file. There click on "More apps"
and choose a suitable software to view such files on your PC or from email attachments.
The COM file type is primarily associated with 'AOL' by America Online, Inc.. If the file keeps popping up as ??.PAYMENT.AOL or ??.PAYMENT.AOL.COM then it's part of Shopping Assistant. Turn it off: Settings, Preferences, WWW, Shopping Assistant tab.
Detailed information for file extension COM:
Other applications associated with file type COM:
- CommandExecutable file.
- Common Object Module
- DOS or CP/M ExecutableCommand file, mostly smaller than 64 Kb. Initial file contents are for executables produced by Borland Turbo Pascal 3.0x only; other compilers may leave a different signature and .COM files created using different techniques may have no signature at all (e.g., see the EICAR listing on this page). COM files are structured so that they load completely in memory and execute from there. Note: This file type can become infected and should be carefully scanned if someone sends you a file with this extension. The Mime types used with this association are: application/octet-stream, application/x-msdos-program, application/x-msdownload, application/com, application/x-com. The identifying characters used for this association are - Hex: E9 4A 2C 90 90 CD AB 43 6F 70 79 72 69 67 68 74 20 28 43 29
- EICAR Anti-Virus Test File by EICARFollowing is a complete .COM file in ASCII format. If you cut/paste this text and save it to a file called EICAR.COM you can test your anti-virus software against it. It is NOT a virus, but anti-virus software has been trained to think it is as a test of the AV software installation. Don't panic when your anti-virus software reacts to the file.
, X5O!P%@AP[4\PZX54(P^)7CC)7}$EICAR-STANDARD-ANTIVIRUS-TEST-FILE!$H+H*, The identifying characters used for this association are - Hex: 58 35 4F 21 50 25 40 41 50 5B 34 5C 50 5A 58 35 34 28 50 5E 29 37 43 43 29 37 7D 24 45 49 43 41 52 2D 53 54 41 4E 44 41 52 44 2D 41 4E 54 49 56 49 52 55 53 2D 54 45 53 54 2D 46 49 4C 45 21 24 48 2B 48 2A 0D 0A
- Psion (Organiser CommsLink Setup File) by Psion PLC
- Unknown Apple II File ((found on Golden Orchard Apple II CD Rom))
'Identifying characters' used on FILExt.com are
provided by Marco Pontello from his TrID database
To change file associations press Windows Key
and then Apps and Features
> Default apps
> Choose default apps by file type
Invalid file associations could be the result of underlying issues within your Windows PC.