Umd extension stands for PSP-Universal Media Disk. You may try to open umd files with Psp Dechook or Psp UMD emulator.
Umd extension is associated with disc type. These discs are used with Playstation machines which developed by Sony firm. You may change UMD files to Iso files with a proper software. Then you may play with iso files with psp machine.
We can recommend you PSP Devhook or PSP Umd emulator to run umd files.
What to use umd
PSP Devhook, PSP UMD Emulator
which page related to umd file
umd Related Searches
You can check related links about umd fileextension.