OK, let's have a look at two items in your Registry.
We are not going to be making any changes during this "look". We are only investigating.
***Remember that it is always important to make a backup of the whole Registry or the specific part of the Registry that you intend to change, BEFORE making that change. That backup will help protect you if the changes that you eventually make cause any problems.
In fact, our "look" at these two areas of your registry will actually be accomplished by making those very backups that are recommended.
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Please open your Registry Editor - Start -
Run - Regedit - Enter
in the Registry Editor, navigate to:
HKEY_CLASSES_ROOT \ exefile \ shell \ open \ command
"
Click once" to
Highlight the
Default Value in the right-hand panel corresponding to
Command
Next:
Click
File - Export
Name the file:
HKEY_CLASSES_ROOT exefile shell open command (the Save function will add .reg to the end of the file name.

In the
pull-down Menu at the top, Select to have this .reg file
Saved to your DeskTop.
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Now Still in your Registry Editor:
Navigate to:
HKEY_CLASSES_ROOT\.exe
(This key is "up" closer to the beginning of this same branch of the Registry) (Use the scroll tab to move upward)
"
Click" once on
.exe
Then click once on
Default in the right-hand panel corresponding to .exe
Next:
Click
File - Export
Name the file:
HKEY_CLASSES_ROOT exe The Save Function will add .reg to the end of this file name.

In the
pull-down Menu at the top, Select to have this .reg file
Saved to your DeskTop.
___________________________
Next:
Remember that you are not to make any changes to the Registry.
Close your Registry Editor now.
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On the
Desktop you will now have two Icons
HKEY_CLASSES_ROOT exefile shell open command.reg
HKEY_CLASSES_ROOT exe.reg
***these are "hot" icons… meaning that if you "double-click" on them, the process to restore them to the Registry would begin.
Fortunately, Windows recognizes that this is a major step and will display a warning asking if you really want to restore(merge) the item.
***Therefore DO NOT double-click on these items!***
Instead:
Right Click on the Icon for
HKEY_CLASSES_ROOT exefile shell open command.reg
Select -
Edit or Open with - NotePad
This will open an instance of Notepad which will display a copy of the current default value of HKEY_CLASSES_ROOT \exefile \shell \open \command
Leave the NotePad with this information Open
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Next:
Right-click on the Icon for
HKEY_CLASSES_ROOT exe.reg
Select -
Edit or Open with - NotePad
This will open an instance of Notepad which will display a copy of the current default value of HKEY_CLASSES_ROOT \.exe
Leave the NotePad with this information Open
_________________________
Next:
Copy the content of the first and second instances of NotePad into your next Reply in this Thread.
When we have a look at Both of these items, we will have a better understanding of what may be causing your problem, and how to fix it.
Move through these instructions carefully and be sure you understand, before acting.
You are not making any changes at this point in the process… only obtaining information for further investigation.
Ask any questions if necessary to follow the above instructions.
Best Regards