You'll have to check with Aman or Chris. I know that you can use a local M3U playlist, but I'm not sure if local XMLTV files are supported at present. (Perhaps it will come soon? I'd suggest trying a file://
protocol URL for an absolute path on your server, but a previous comment from Aman makes me think that won't work.)
At present, I think your only option is to use a minimal web server to serve the file. I'm sure there are such things for Windows.
Edit: As indicated below, all that is required is the path to the local XMLTV file, no web services required.