'File Not Found'?

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I've got 2 machines, both running XPSP2. I often use one to access the other via Remote Desktop. This works perfectly except in one, rather curious, instance; if I try and control WMP10 via RD, I get 'File Not Found' errors on any track or album listing. I can comtrol WMP via Desktop Sharing, but it just won't work under RD. Any ideas?