Saving File Extension Informations?!

[Nephilim]

Does anyone have any idea how to save the file extension settings? I espacially would like to save the .pdf extension as I use Acrobat Reader 6 to read pdfs and Acrobat 6 to work with them. As another example: I would like to watch my .avi files with Zoom Player, but I don't want to change the settings everytime I install Windows.

I found out that HKEY_CLASSES_ROOT has a complete list of file extensions, but I wasn't able to reconstruct the .pdf settings.

I tried to use the WinXP Profile Manager, only to find out that it collects all .pdf files and zips them.

Thanks in advance