Set Notepad++ as the default EDIT program for '.txt' files?
Here is how I fixed it:
RegEdit: open: Computer\HKEY_CLASSES_ROOT\SystemFileAssociations\.txt
Add the following three key values: shell, edit, command
so you have this address:
Computer\HKEY_CLASSES_ROOT\SystemFileAssociations\.txt\shell\edit\command
With command selected in the left pane, you see:
(Default) REG_SZ on the right.
Right click on (Default), select Modify... then add this Value data:
"C:\Program Files (x86)\Notepad++\notepad++.exe" %1
Close RegEdit.
Now I can right-click > Edit any ".txt" file and it opens Notepad++.