How to Hide Extension for a Specific File Type

The Folder Options setting Hide extensions for known file types turns on or off the display of file extension for all registered file types. To hide or show the extension for an individual or specific file type in Explorer, you can do it by adding the NeverShowExt (REG_SZ) registry value in the file type’s ProgID. Here are a couple of examples, which should work in all versions of Windows.

Hiding Extension for “.Contact” File Type

If you open the Contacts folder, each contact is displayed with .contact file extension.

To hide the extension for .contact file type, open the Registry Editor (Regedit.exe) and go to:


Note down the ProgID for the file type, which is the (default) value in the right pane.

Go to the ProgID key, which in this case is contact_wab_auto_file. It’s located here:


In the right-pane, create a String value (REG_SZ) named NeverShowExt

Log off and login back for the change to take effect.

If you want to see the changes without a re-login, you can do a clean restart of the shell. For instructions, see Restart Explorer in Windows 10 and Windows 8, Restart Explorer.exe in Windows 7.

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Ramesh Srinivasan is passionate about Microsoft technologies and he has been a consecutive ten-time recipient of the Microsoft Most Valuable Professional award in the Windows Shell/Desktop Experience category, from 2003 to 2012. He loves to troubleshoot and write about Windows. Ramesh founded in 2005.

2 thoughts on “How to Hide Extension for a Specific File Type”

  1. There are certain file formats that don’t exist there in regedit. Like .bak for example. Unfortunately, this method doesn’t address such situations.


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