Ever wanted to view FLVs in Leopard’s Quick Look? Combine Perian with the FLV Quick Look Generator and you are golden.
Step 1: Install Perian
Perian is a free QuickTime Component that adds native support to lots of video formats like divx, avi and flv. Download Perian and install it.
Download Perian. To install just double click the file Perian.prefPane located on the top left of the newly mounted disk image.
Once installed you will see the Perian Preference Panel. Nothing to do here, just close it, unmount the disk image and delete the file from the Downloads folder to keep things neatly.
Step 2: Install FLV Quick Look Genertor
Download the FLV Quick Look Generator and place the file flv.qlgenerator in your home or main ~/Library/QuickLook/ folder. Create the folder if necessary.
There are other plugins available form the same author at: http://homepage.mac.com/xdd/.
Now just select an FLV file and hit that space bar to get a Quick Look! You might need to either restart the Finder or log out and back in to your Mac for it to become available.
Hello, I am Melvin Rivera; creator of 
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Hi. Where is the breadcrumb coming from at the bottom of the window in the first picture?
When you download Perian, it comes as a Disk Image. When that Disk Image is mounted Mac OS X reads it like a mounted drive. That is where the breadcrumb comes from.
good idea! thank you for the tip!