This forum may help your needs:
http://www.hummy.org.uk/forum/viewtopic.php?t=367
Jeff
Humax 9200 PVR transfers files from HDD to computer via USB cable. It is very slow but transfers files ok freeing up the HDD. Now I have the files on my computer I see there is no file extension so I don't know how to open or play them. Can anyone help please?

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