, Please 
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Now since I count this as a software no one should be without when I say without annoying software I really mean those rubbish youtube downloaders of which there are thousands but also that this is specifically for videos you've watched already and want to download without the inanity of redownloading it with some piece of rubbish software. Now if you wanted you could use this is place of downloading through software as I often do, all you have to do is open the video and let it run until the loading bar is fully red and the video is loaded.
So imagine this, you have just watched a youtube video, perhaps a music video or perhaps you might want to watch it later offline or maybe as in my case your cousin likes to play world of warcraft and therefore, his raid will be coming up soon and he'll be whining that he wants the internet to himself; whatever your reason it is useless downloading the video again or downloading any software at all (with the exception of the God of software's unlocker) so here's what you do. As all windows users should know you have a folder simply called "temp" which holds temporary files (go figure). for those of you who like me are on vista (and probably windows 7 it will be located at "C:\Users\YOURNAME\AppData\Local\Temp" and at a similar address for XP and older versions I am sure. if you visit this folder you will see a sea of oddly name files with odder extensions and one of these is your youtube video. Now if you want a mp4 version of the video you are better off with some rubbish software than with this trick, this is for people like me who use and love the worlds best mediaplayer "VLC media player" which you can find by googling the term. It is, no joke absolutely magnificent.
Now flash files always are name fla......... where the "dot dot dots" are replaced by a random string of numbers and possibly a letter or two as well, now if you're browser is like mine when you close the tab with the video (or the window) the temporary file disappears to never be seen again, so you should (assuming you still have the youtube video open and no other flash content) only have one fla.... file. If you have multiple make sure to close any other flash content and attempt to copy each in turn into a folder of any description, if it succeeds simply undo. The one you want will throw and error should you try to move it as it is still tied in with your browser of choice (google chrome in my case). Here's where
