Yes it stands for Unreal Playstation Beta.
But...the UPB prefix is intended for maps that are being retextured, your version is not, therefore your fixed file shouldn't be named like that, instead it should be named E1L1CPSX or something like that. Just note, the LEONEW directory, I don't know why delacroix included it in his files, those files are simply backups or developement stages, those were not meant for public consumption. Latest one of that is UPB-E1L1Aold.
EDIT: I checked your conversion, it seems to work only at versions 226 plus, but you only fixed some bsp hole, that is not acceptable, if you want to make fixed version and not a full retexture do it under 220, besides I am going for 225 plus compatibility (even 224 should work) of the final files.
I will take over E1L1A next and finish it up..
But...the UPB prefix is intended for maps that are being retextured, your version is not, therefore your fixed file shouldn't be named like that, instead it should be named E1L1CPSX or something like that. Just note, the LEONEW directory, I don't know why delacroix included it in his files, those files are simply backups or developement stages, those were not meant for public consumption. Latest one of that is UPB-E1L1Aold.
EDIT: I checked your conversion, it seems to work only at versions 226 plus, but you only fixed some bsp hole, that is not acceptable, if you want to make fixed version and not a full retexture do it under 220, besides I am going for 225 plus compatibility (even 224 should work) of the final files.
I will take over E1L1A next and finish it up..
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