Welcome Kambiz, and thanks for your interest in Vienna MIR!
It's exactly as DG pointed out in his message above: MIR 1.0 is for Vienna Instruments only, MIR 1.1 will be open for 3rd-party VSTi's. It will be released in a few weeks (we are in the beta-testing phase right now).
If you want to get a first impression _now_ without "wasting" a demo-licence, you could download the MIR manual from your User Area. It's available for free.
BTW: Some new "official" audio demos are mixed already, with styles ranging from pure classical over Avantgarde to Jazz. They will be announced soon.
HTH,
/Dietz - Vienna Symphonic Library