I've added a file extension to the ignore.conf but I marked the "Apply rule for all workspaces" and that adds it to another ignore.conf file that's not in my repository.
I'm on macOS and I can't find where that global ignore is. Googling found it for Windows but not for macOS.
Any ideas?
I guess you don't have a "plastic-global-config" repo so the client configuration in a macOS should be found in the following paths:
/Users/xxx/.plastic4/ignore.conf
or
/Applications/PlasticSCM.app/Contents/MonoBundle/ignore.conf