Notes about the UNM file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries, unused processes and other unfavourable system settings to identify slowdown issues.
The UNM file type is primarily associated with 'XMap' by Delorme. XMap scalable mapping software that provides users with digital mapping tools. Often found in the \Program Files\XMat 40\MapDocs folder.