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file format changed to ccleaner, can't open or change format

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I don't have any idea how it happened, but I have several document and PDF files that are now saved as CCleaner. I can't fix it. I can't open any using other formats. I can't open them directly as saved. I've lost MUCH IMPORTANT information that I can't recover. How do I fix this? 

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They are not lost, a setting has been changed and you can change it back quite simply.

To reassociate your PDF's back to opening with Adobe, or whatever you want to open them with,

  1. Right click on any PDF file.
  2. Select 'Open With'.
  3. Select 'Chose another app'.
  4. Select the app you want to use to view PDFs.
  5. Tick the box 'Always use this app to open .....'
  6. Click 'OK'

See the screenshots in this post: https://forum.piriform.com/topic/55455-ccleaner-browser-pdf-files/?tab=comments#comment-310603

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