As I often have problems setting up a custom filetype for my Document-Based Applications I decided to write a short tutorial on how to do it (actually just one image). You just need to enter most of the information twice, once for the Document Type and once for the Exported UTI.
Look at those two lists for what types you have to choose:
List of Uniform Type Identifiers
Wikipedia Article about MIME (including common types)
May 16, 2014 at 12:22
Howdy! Would you mind if I share your blog with my twitter group? Theres lots of people that I believe would really enjoy your content. Please let me know. Thanks cgcgbabfaabe
May 16, 2014 at 12:26
No I wouldn’t mind at all. Feel free to share my blog 🙂