USB port transfer of files to Samsung Galaxy Tab (Icecream Sandwich)

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http://www.mobileread.com – Hi, I have an older version of kindle. I've found it useful to transfer files from my PC to the Kindle using the USB port. I'd like to be able to do the same on my new Samsung Galaxy Tab (icecream sandwich) 8GB. I'm a writer so I often convert my work-in-progress to kindle compatible file using Calibre. That is readable. But if I download books from Amazon and try to do the same, I get the message: "Invalid Item Please remove the item from your device and go to Archived items to download it again." Is this a file format issue mobi vs. prc vs. azw (no clue about the di (HowTos)