When the exe file cannot be opened and open in notepad or other programs, means that the file association for the files “.exe” it's broken, probably due to one program or being mistakenly associated with another.
However, this problem can be easily eliminated by following the steps below:
Method 1:
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This is a common problem when files are incorrectly associated, either by changing the default file associations or accidentally opening a file with another program where it is set as the default, What (notepad, painting, Wordpad, etc.).
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To solve the problem, download and run the registry editor key from here
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Right-click on the downloaded exefile_cu.reg file and select »Open with«, In »open with» select Registry Editor and when asked for confirmation, select yes.
Method 2:
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Click Start and type Regedit
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Press Enter and in the Registry Editor window select File -> to import
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Choose the downloaded exefix_cu.reg file and click Open to import it.
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It will overwrite the wrong values in your registry with the correct ones.
Method 3:
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Press “Windows” + “R” and writes “regedit”.
Run the registry editor
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Press “Enter” and confirm the message to open the registry editor.
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Navigate to the following registry key:
HKEY_CLASSES_ROOT.exe
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Please select “.exe”, right click on the file “Predetermined” in the right pane and select “Modify”.
By clicking on «Modify»
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Enter “exefile” as the value data excluding symbols “.
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Browse and click the following registry key:
HKEY_CLASSES_ROOTexefile
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Select the folder “Exefile”, right-click the key “Predetermined” and select “Modify”.
By clicking on «Modify»
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Enter “% 1″% * as value data, including symbols “Y *.
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Browse and click the following registry key:
KEY_CLASSES_ROOTexefileshellNabierto
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Select the folder “To open”, right-click the key “Predetermined” and select “Modify”.
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Enter “% 1″% * as value data, including symbols “Y *.
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Close Registry Editor and reboot the system.
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Run the registry editor
By clicking on «Modify»
By clicking on «Modify»



