AllSync & AllDup

..... and please do not tell me there are no dumb questions. If it's something I should have been able to deduce from the program settings, it's dumb. On the other hand, I'm not as sharp as I once waqs about such things, so I might as well ask directions.

That said, how does one restrict the duplicate checking to a single extension, such as .jpg or .wpd? I have played games with the two filters, and it doesn't seem to do me much good. May I have some assistance, please?

Many thanks.

Instructions:

1. Activate the option "Use file filter"
2. Deactivate all file filters at the list.
3. Create a new file filter with the text "*.jpg".
4. Activate the option "Inclusive..."
5. Deactivate all the options below the option "Inclusive...".

That's all.