There is only one file type that uses the .TRAK extension:
Traktor Content Pack File
Package created for Traktor, a DJ audio mixing application; stores samples and settings for the digital mixer that comprise a "remix set," or "content pack;" used for packaging custom DJ sounds together for making different audio mixes.
TRAK files allow remix sets to be shared with others and across Mac and PC computers. To import a TRAK file, simply double-click it on a computer that has Traktor installed. Alternatively, you can right-click on Track Collection in Traktor and choose "Import Traktor Pack" from the drop down menu.
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Updated: May 18, 2013