No, you cannot use a conditional property in a css file. What code is it you're having a problem with? Most issues can be resolved without needing to use separate code for IE6. Of course there are some issues that you can't get around, so if you use the MS conditional code the previous posted showed and only include the changed properties in that css file, it should load quicker. Do you have an example of what the problem is?
Shawn Steward
Web Developer
www.shawnsteward.com