GT2 Car Viewer v0.2b is now available(download link on the first post)!
It support all the demos that I know, supported demos are:
*GT2_EARLY (1st Build)
*GT2_BONUS (2nd Build)
*GT2_EURODEMO53 (3rd Build)
*GT2_TESTDRIVE
Thanks to
Fabrizio for providing me with those demos!