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What are UMD filetypes?
What are UMD filetypes? –
This one from Open Season: psx2game.umd
I'm having a guess here but I'm assuming it's got to do with games that have PSP to PS2 connectivity. I've seen .UMD filetypes on some PSP games. I also don't know if Open Season does have PSP to PS2 connectivity but i guess you can see if some other PS2 games that have PSP connectivity such as Jak X or Pro Evolution Soccer 5 have .UMD files on them.
149MegaBytes in size
Maybe it's a universal image for both PSP and PS2?