|plurplelarity, The Usage Instructions tell you exactly what to do with that file.|
To fix the association for a particular file type, download the corresponding fix from the above links table (Use Right-click - Save as option in your browser to download the fixes). Unzip the fix and extract the .REG file to the Desktop. Right-click the REG file and choose Merge. Note that you need to be an administrator to apply these fixes.
I prefer the Free version of Foxit Reader over Adobe Reader.