Oh, and if the user was idle more than something like 5, 15, or 30 minutes, LimeWire would switch to random chunk requests regardless of MIME type, assuming the user didn't need a streaming download. I hope full-screen media players prevented the user from being counted as idle.

I vaguely seem to remember WMV and ASF also needing some information from footers in the file, and therefor also prioritizing the last MB of the file.

This was all implemented using the Strategy object oriented design pattern, to make it easier to play around with many alternatives and make specialized strategies for specific MIME types.