default application to open folders with
To resolve the issue expressed in the OP, I'd follow the directions as shown by the developer of Path Finder using information in How do I completely uninstall Path Finder?, which is quoted below, for your convenience.

Also note that if for some reason you what to keep that backed up copy of Path Finder, first I'd archive it to a zip file, then delete it per the directions below.

Quoted from the link above:


  Before removing the Path Finder application, make sure to reset all
  preferences that tell the system to use Path Finder by default. After
  that, make sure to relaunch all running applications, logout or reboot
  so applications can re-read the default settings.
  
  From Path Finder's preferences window, make the follow changes:
  
  Path Finder 6 &amp; 7 preferences:
  
  
  In the Finder tab, disable these options:
  
  
  Hide Finder's desktop
  Quit Finder when Path Finder launches
  Enable Finder's "Remove from Dock" menu option
  
  In the General tab, disable these options:
  
  
  Launch Path Finder at login
  Set as the default file browser
  
  
  
  Path Finder 5 preferences:
  
  
  In the General tab, disable these options:
  
  
  Launch Path Finder automatically after log in
  Quit the Finder automatically at launch
  Hide Finder's desktop
  
  In the Reveal tab, disable "Set Path Finder as the default file viewer"
  
  
  To remove all traces of Path Finder, delete the following files and
  folders (some of these may not be on your system).
  
  FreeMacSoft's free application AppCleaner is an excellent tool for
  automating this process. Just
  make sure to disable the settings listed above before using
  AppCleaner.

  /Applications/Path Finder.app
  /Library/Application Support/Path Finder/
  /Users/&lt;username&gt;/Library/Application Support/Path Finder/

  /Users/&lt;username&gt;/Library/Preferences/com.cocoatech.pathfinder.plistv
  /Users/&lt;username&gt;/Library/Preferences/com.cocoatech.PathFinder.plist.lockfile
  /Users/&lt;username&gt;/Library/Preferences/com.cocoatech.PathFinder.LSSharedFileList.plist.lockfile

  /Users/&lt;username&gt;/Library/Caches/com.cocoatech.PathFinder/
  /Users/&lt;username&gt;/Library/Caches/QCCompositionRepository-com.cocoatech.PathFinder.cache

  /Users/&lt;username&gt;/Library/Contextual Menu Items/Path Finder CM.plugin 
  /Users/&lt;username&gt;/Library/Saved Application State/com.cocoatech.PathFinder.savedState/

  /Library/PrivilegedHelperTools/com.cocoatech.pathfinder.SMFHelper[#]
  /Library/LaunchDaemons/com.cocoatech.pathfinder.SMFHelper[#].plist

  
  [#] Can be a number, eg. 6, 7, etc.