The simulation library compilation wizard of EDK can't find modelsim

Hi, All:
When I complie the simulation library in EDK 9.1.01i using the library
compilation wizard, it told me that "modlesim is not found! please
ensure that the simulator is correctly installed and/or the necessary
envoroment settings are available". But I do have modelsim se 6.2e and
6.1e intalled on my machine and they work fine. The only system
variable I set for modelsim is LM_LICENSE_FILE, should I set any other
variables?
And EDK says it only support Modelsim SE/PE 6.1e. I am wondering can't
it support the later versions? But anyway, I intalled 6.1e and got the
same result.
By the way, the wizard didn't work when I used EDK 8.2 and I had to do
it manually? Am I wrong somewhere?

Thanks a lot,
Rebecca