Valve Hammer Editor Autosave File
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What is a VMF_AUTOSAVE file?
Auto-generated file created by Hammer Editor, a program used to build maps for Valve games such as Half-Life; stores an autosaved, backup copy of the currently opened .VMF file.
VMF_AUTOSAVE files are used for recovering map data in the event the VMF file becomes corrupted, or if the program unexpectedly crashes.