There is only one file type that uses the .WMT extension:
WinMount Virtual Disk File
Virtual disk or Ramdisk file created by WinMount, a compressed file management program; stores a virtual hard drive tha can be mounted by the program; includes the volume format (FAT32, NTFS, Unformatted) as well as the disk size.
WMT files are used for mounting compressed archives to virtual disks. The archives can be in one of several formats, including .MOU, .ZIP, .ISO, and others.
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Updated: July 21, 2010