.ZM3 File Extension

Third recording of a Super Nintendo (SNES) game played with the ZSNES emulator; can be played back using the ZSNES program; the ".zm3" extension is used for the third recording, while the first two movies may use the .ZM1 and .ZM2 extensions.

Single ZSNES video files may use the .ZMV extension.

Microsoft Outlook Express Folder (.NCH) file renamed by ZoneAlarm Mailsafe, part of the ZoneAlarm Internet Security Suite; renames the file extension of an Outlook Express Folder as a safely precaution so that it cannot run malicious code.