|Raycer, The first site offers file association fixes for many Windows file extensions. You would click on which file extension you want to fix and download the reg file fix which is a zipped reg file. You would save it to your hard drive then after it's downloaded unzip or extract it then double left click that reg file or right click that reg file and choose Merge to merge the contents into the registry. Instructions are on the page.|
Windows® XP File Association Fixes
At the second site in the upper right of the page you would type in the file extension you're trying to open then click the Search button, An example would be pdf files which I'm posting a link to, Toward the bottom you'll see:
"You are viewing 7 of 8 entries click this link to expand the remaining entries"
You would click on the blue, underscored "click this link" to get more info as to which programs can open pdf files.