If I search my registry (Windows 10 version 1803) there are many occurrences of NoOpenWith. This is way off topic, but here is some information on the use of NoOpenWith:
From “Microsoft Windows Registry Guide” by Jerry Honeycutt
Applications
To display an application in the Open With dialog box, that application must register
in HKCR\Applications. Each subkey in Applications bears the name of the program
file. For example, Notepad is in HKCR\Applications\Notepad.exe. You must also add
the OpenWithList key to the file extension key, as described earlier in this appendix.
You find combinations of the following values and subkeys in the program’s subkeys:
■ FriendlyAppName. This REG_SZ value contains the application’s friendly name.
This value can contain a string, but it more likely contains a value in the format
@file,- resource, where file is the name of the program file containing the string
resource identified by resource.
■ NoOpenWith. This empty REG_SZ value indicates that Windows should not add
the program to the Open With list.
■ SupportedTypes. This subkey contains a list of file extensions, including the
leading period, which indicates which type of files the program can open. For
example, HKCR \Applications\mplayer2.exe\SupportedTypes contains the
empty REG_SZ values .asf and .mp3, indicating that the program can open files
that have these file extensions. This list filters the Open With list.
OpenWithList
Sometimes users want to open files with applications that aren’t associated with the
file class. For example, a user might want to open a document in WordPad instead of
Microsoft Office Word 2003. In other cases, users might want to open files that have
no file associations. The Open With dialog box allows both scenarios.
The applications you see in the Open With dialog box are registered in HKCR
\Applications. This key contains one subkey for each application, and the subkey
bears the name of the program’s executable file. You can prevent Windows from displaying
an application in the Open With dialog box by adding the REG_SZ value NoOpenWith to HKCR\Applications\program.exe.
So it appears that the NoOpenWith registry value simply blocks an application from showing up in the “Open with” dialog.
But there are many subtleties in the registry structure, so there may be more to it than that. For example:
HKEY_CLASSES_ROOT
HKEY_CLASSES_ROOT is a global hive, which means it can contain information that applies to all the users on the computer, and is viewable by every user. This is in contrast to some hives that have information that applies only to the currently signed-in
user.
However, because HKEY_CLASSES_ROOT hive is actually combined data found in both the HKEY_LOCAL_MACHINE hive (HKEY_LOCAL_MACHINE\Software\Classes)
and the HKEY_CURRENT_USER hive (HKEY_CURRENT_USER\Software\Classes), it also contains user-specific information as well. Even though that's the case, the
HKEY_CLASSES_ROOT is still able to be browsed by any and all users.
This means, of course, that when a new registry key is made in the HKEY_CLASSES_ROOT hive, the same one will appear in HKEY_LOCAL_MACHINE\Software\Classes, and when one is deleted from either, the same key is removed from the other location.
If a registry key resides in both locations, but conflicts in some way, the data found in the signed-in user's hive, HKEY_CURRENT_USER\Software\Classes, takes priority and is used in HKEY_CLASSES_ROOT.
I don't have the background, time, or inclination to pursue this any further, but I am happy that my QFX association works and that bobjbkin has fixed his problem.
Bill Becker
Opening *.qfx stopped sending the file to Microsoft Money for me
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