Time Machine backing up huge files after opening wmv file in QuickTime

Good evening to everyone;
I have noticed that after I open wmv file (or any file that needs conversion) in QuickTime; the next TM back up backs up 10+ GB to my Time Capsule. Can anyone pls explain to me where can I find this big file so I can exclude it from the back ups?
And maybe why are they even created?
Not sure if it is relevant but I also have Perian 1.1 and Flip4mac latest version installed, which lets me open all kinds of files in QuickTime.
Thanx a ton

Might be that the Quicktime cache is hiding the data. In the Users>Libraray>Caches>Quicktime>Downloads, you'll probably see a pile of items. I've never gotten rid of all of them, but you can give it a try. Post back if you find anything interesting out.

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