WipeOut Pure, besides being a really great game, is one of the few games to get frequent expansions...
Only thing is some packs are for the us version, some are for the jap version...
Unless... (don't shoot me if someone allready posted this)
I can't test this, cause I'm a work, but this just might work (or allready works as it seems pretty obvious):
Looking at the savegame folders on PSP they usually include the UMD/release number. A typical JAP Wipeout expansion may reside in the SAVEDATA folder:
UCJS10007DWIRE05 (Wire 05/JAP)
A US Expansion in the folder:
UCUS98612DCLASSICPACK1 (Classic Pack/US)
So how about renaming the first have of any JAP pack to UCUS98612D so Wire 05 would be in folder:
UCUS98612DWIRE05
and vice versa to get these packs working on different regions.