Use this version of multiman
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put it in the root of your usb drive and install it onto your ps3. Once it is there you need to create a folder called GAMES if it is not already there onto your ps3's dev_hdd or the root of your usb. You should see your games in multiman now, once you click on a game it will ask you if you would like to boot from xmb, select no and it will send you back to the xmb now to to the app_home folder and click on it, the game should run as if it were on a disc if it is compatible, if that doesn't work try selecting "yes" when it asks if you want to boot from xmb.