I can tell you that most filenames of docs downloaded from Amazon are in the following format:
<Book Name>-asin_XXXXXXXXXX-type_YYYY-v_Z.azw
Where XXXXXXXXXX is a 10 digit alphanumeric string, YYYY is a type identifier (EBOK, FEED, PSNL, possibly others), and Z is a varialble-digit number which appears to be a version ID; most books are 0, but FEED (blogs) seems to be an incrementally increasing number. Don't have a magazine sub to tell you what those look like.
Anyway, internally, there's a string for PSNL, EBOK, etc. which is what the Kindle really uses to classify the book. However, just changing the string won't do; there's a flag somewhere that probably has to be changed. I just don't know what is is.
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