Thanks Garrettroyce for the concise and informative reply. X10 should post it on their signup pages so those interested in windows support are well-aware of the limitations upfront.
Again, much appreciated.
The x10 "Free Webhosting" sign up page at http://x10hosting.com/freehosting.php mentions ASP.NET support in the free package.
I went through the signup process, and I see I am on a linux server with an apache web host, and with the exception of frontpage extensions I see nothing about...