Updated:
The reason you need this is because your company only uses 64 bit tokens and you have a Mac and want to use Remote Desktop from Microsoft to get your work PC. You need RSA to authenticate and then you use VPN to get into your network. I had this working, but Snow Leopard broke Crossover and so now I'm just updating Crossover.
RSA for Windows 3.07
OS X : 10.6.6
Crossover : 10.0.1
Macbook Pro 13 inch - circa 2010
Installed using MSI from RSA. No errors, no warnings, no odd windows. Was able to invoke Securid and have it read token flawlessly.
Good luck.