Limitting Metaeditor "Find In Files" Scope

 

I am interested in excluding the default MQL source files from the Find result. The Find dialog does not allow combining multiple directories to avoid the default files.
Deleting the default source files won't help, they repopulate with the terminal start or update.

Did anyone find a way to search multiple directories (e.g. scripts + libraries + include), but filtering out results from the default source files? The only way I found so far was running an orphaned Metaeditor with the /portable /skipupdate option from withing the purged directory, however it did not make much sense.