Mod parent down. Win32 designed for Windows NT.
Going a step further, the advertising on the product itself says "compliant with other browsers. Some loss of user experience may occur" - you know what that means? It means that if you use a browser other than IE to try to access this product, nothing works.
I work on Sharepoint. I consider IE a bug and user FF as my dev browser. And atleast 70% of the stuff works. What doesn't work is integration with MS Office.