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  Your question is quite vague, but if you change a file extension from .txt to .doc there is nothing going on in the registry.

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  Wednesday, March 12, 2014 10:39 AM
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  Hi,

  I agree with Rick. The file type here only used for the file to be recognized by the Windows shell in different methods. If we change a file extension, it is similar to change the application we would like to open this kind of file with. 

  And Windows registry is a central hierarchical database used in Windows to store information that is necessary to configure the system for one or more users, applications and hardware devices.

  For more information regarding file types and Windows registry, please take a look at the below links:

  File Types

  File Type Handlers

  Windows registry information for advanced users

  Best regards

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  Michael Shao
  TechNet Community Support

  

  • Marked as answer by blair deng Monday, March 24, 2014 9:34 AM

  Thursday, March 13, 2014 8:55 AM