Thanks Malcolm. I tried your instructions, but still get the error message, with the details:

The path to the file is not correct
Windows Media Player cannot find the file. The server name, shared directory name, or file name may be incorrect.

Check the file name and path for any misspellings or discrepancies. If this error message persists, contact your content provider for the correct location of the file you want to play.

Error ID = 0xC00D1197, Remedy ID = 0x00000000

As, however, everybody else seems to be able to view it, it must be some obscure glitch on my computer