No model loaded in Viewer

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I've installed O2 and loaded an old model inside but when i launch the viewer, the viewer stay empty.

I've tryed with others models and they aren't loaded in the viewer too.

My version of the game is DVD 505 games, my OS is Vista x64.

Thx for all help provided.

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: SOLVED :

It was the config of the shorcut for O2 with my Vista x64.

I've set run as Administrator and make run as Windows XP SP2.

Now it works ...