welcome to the notepad++ community, @Alain-Vercammen
thank you for asking.
you are absolutely correct here, to discuss possibilities or pre-discuss issues with a large audience of community members and devs.
unfortunately long full path names are still a windows problem in general.
you can try to use the free utility FileSeek to test if it is working on your path structure length.
it has notepad++ integration and a lot of include/exclude, date and regex functions. much more than can ever be integrated into notepad++.
if you like that it gets eventually solved, e.g. with path workaround tricks, directly at the notepad++ core, you can also follow our FAQ Desk: Feature Request or Bug Report guide, to search the issue tracker for similar path length issues, or file a new issue, if you can’t find any matching issue.
many thanks and best regards.