I had both Solidworks Maker and Professional on my computer which caused all sorts of issues.  I've since deleted SolidWorks Maker and only have Professional on my computer.  I had to fix some registry errors to make all that work, but found answers on the forums.  

Now I cannot open any files as they're all associated with the Maker version instead of the professional version.  This is the case for files that were originally created in Professional.  

How can I re-associate the files originally created with professional back to the professional version?