*.cso and *.iso are the formats of the psp games
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PSP Video 9 converts videos from various file formats to a format that the PlayStation Portable can play. Some of the formats it can convert are xvid, avi, divx, and mpeg. These formats are converted to either MPEG-4 or H.264.
the game has to be game share compatible. you basically got to gameshare on your psp and then your friend loads the game up n his psp.
play the ps3 games in psp they will converted to psp games
You can copy games from one PSP memory stick to computer and then copy to another PSP's memory stick. Make sure you put the game on the folder 'GAME' on the memory stick.
PAL and NTSC usually refer to analogue television formats. Since the PSP has its own proprietary screen, PAL and NTSC in this case refers to the region the PSP comes from, which is important for the purposes of UMD movies and some online services. That means a US PSP can play a game from the UK, the video format is exactly the same. But UMD movies are region restricted so a US PSP can only play US UMD movies.