Proper video format? AVI, MOV, MP4 not working

[sixt7gt350]

I bought a refurbished NS-2V17 from Bestbuy outlet and they didn't include the software CD.

All answers from Bestbuy's MP3 support in India have been directing me to the Sansa website for their media converter. It doesn't recognize my player being connected, so it's no help, either.

I have plenty of audio/video conversion software already, but I need to know the correct format. (preferably converted with the intended software, but since Bestbuy support has been no help....)
All I really need are the free (yes, the free ones that come with it) music, videos, and album art that come on the device. (or are they on the software CD? -I wouldn't know since my unit was a refurb with clean memory and didn't come with the CD!) Analyzing those files would tell me what I need to know.

Any help or direction would be greatly appreciated.

Thanks in advance.

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