Manipulating the mime type of the Jazz Source Control property

This question has two parts. Our project uses a number of python files with a *.py extension that are not recognized as text files by default. This means that they are associated with a mime type of application/unknown instead of the expected text/plain. This means that the diff editor won't work on these files because it thinks that they have binary content.

1)  Is there a way to search for files by their associated mime type so that I can find all files that might have this issue and change them?

2) Is there a way to configure RTC to recognize additional file extensions as text by default in order to prevent this problem from happening again? I am aware that individual developers can configure their RTC client to recognize additional file extensions, but I am hoping that there might be a way to configure this at the server level once and for all.

Brian