Hmm... i've tested that... work's here... strange O_o

Well, here's another hint:
Open the registry editor (Start -> Run -> "regedit")

Navigate to...

Key: HKEY_Current_User/Software/ASCII/RPG2000 (2000)
Key: HKEY_Current_User/Software/Enterbrain/RPG2003 (2003)

Add a new "String" called "RunTimePackagePath" and set it to any value ('123 'or so ^^). Now right-click on the Key (HKEY_Current_User/Software/ASCII/RPG2000) and choose "Export". Save the file whereever you want -> If you want to play your game without the RTP installed, you need to import the .reg-File (With a simple Doubleclick).

~RB~