Example: atom.exe is located at HKEYCLASSESROOT. How to Change File Association to Unknown Program in Windows 10Step 1: Open 'Notepad' App by typing Notepad in Search Box and type cd.Step 2: Click on 'File. And I have a memory that something occasionally goes wrong and leaves the x86 version in the registry, even after the 64-bit is installed. 16 Answers Open regedit find the application you are looking for in HKEYCLASSESROOTApplications. From what I remember, each extension gets an OpenWithList which includes notepad .exe, and then the registry looks in Applications\Notepad .exe to find out the actual path to that command so if that key points to a non-existent executable, Windows ignores that OpenWith option. (I’d do a full search of the registry, but I think it’s something like HKCU\Software\Classes\Applications\notepad .exe and/or HKLM\Software\Classes\Applications\Notepad .exe, both of which might map to HKCR\Applications\Notepad .exe. If you have a 64-bit Notepad installed in C:\Program Files\Notepad , search your registry for C:\Program Files (x86)\Notepad and replace any such instance with C:\Program Files\Notepad – it may be that something wrote the wrong value into the registry (maybe a previous 32-bit installation), and so Windows 10 looks for a nonexistent location, cannot find it, and then refuses to associate an OpenWith action for Notepad .
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