Duplicate File Finder not finding duplicates with wildcard filter

Greetings
The duplicate finder below works if the filter checkbox is NOT ticked.
Does not find duplicate if it the filter is ticked.
Is the filter configured ok?

Found the issue running
12.21 Build 7478 and
Pro 12.30 Build 8360 x64 OS 10.0 (B:19044 P:2 T:1) SP 0.0

Operating system:
EditionWindows 10 Home
Version21H2
Installed on‎2021-‎05-‎01
OS build19044.2251
Serial number063816493857
ExperienceWindows Feature Experience Pack 120.2212.4180.0

Are you aiming to match *.dcf or *? The filter name says one thing but the definition says another.

I see that thanks Leo.
Have I fixed it below?
I think I have saved the wildcard filter *.dcf and maned it DCF Files
Still not working though.

I think the filter is working but in the opposite sense to what I assumed.
The filter specifies files to search
(1) So my filter as it stands will only check for duplicates files which have .dcf extension.
(2) I need create a filter which will check for duplicates for all defined files ACCEPT for dcf files.
Ignore DCF files.

Q1 Is my understanding (1 above) accurate?
Q2 Is such a filter (2 above) feasible?

With thanks again...

(https://www.gpsoft.com.au/help/opus12/index.html#!Documents/Duplicates.htm):

Voila!