How to prevent plugin resources from being filtered out

I am developing a plugin for Intellij.  I have a resources folder marked as source. When I prepare my plugin for deployment, the resulting jar has some of the resources excluded (for example, files with extension ".vm").

How do I change the exclusion filter for intellij plugin development so it doesn't filter out those files?

The only way I have found around this is to generate an ant build for my plugin, and then change the include pattern sets for "compiler.resources" to include *.vm.

Thanks for your help.

Matthew