Hey, i just got my psp downgraded to 1.5, yipeee!!
anyways when i get Iso's sometimes when i extract the folder it 1 file(iso) and i put it into my ms root/ISO folder, and everything works.
I just got syphon filter, and when i extracted it there is like 12 diferent files, all about 15 mb each.
What do i do with them?
thank you.

Are they named like syphonfilter.part1.rar and syphonfilter.part2.rar or something like that? If so then that means it's a file that has been split when it was compressed. Get a program called winRAR (Trial version is free) and place all of your files into one folder, then right click the first file and click extract. That should put all of the pieces together for you.

no, its not like the games you download on this site, i get like 13 different files called 001, 002, 003......
its wierd.
its like newer games have the 13 files or so, madden 06, midnight club 3, syphon filter. ect...
So what should i do?

Hmm . . . I don't know. My best guess is like what I said earlier, that the file has been split. (usually file host sites like rapidshare, megaupload, sendspace, filefactory, etc. have upload limits for file sizes.) This means that since ISOs are generally very large, the person who ripped the iso probably had to "split" the ISO into smaller pieces (13 of them in this case). I think that the uploader probably renamed the files from blahblahblah.part1.rar into just 001 so that the file name isn't suspicious and won't get deleted. (the sites that I found have a lot of people who do that.) You're better off in going back to the site where you got the game from and reading around there for download instructions or go ask around in the forums there if they have one.