Every time a new project is created and is saved as a new file, the file name does not default to have an extension of *kra. Rather, it defaults to *.exr so whenever Enter is pressed after typing a filename, the project isn't being saved as *.kra but rather as *.exr and the user is prompted to flatten the image.

Reproducible: Always

Steps to Reproduce:
1. Make a new project.
2. Save it with any filename of choosing without extension (e.g. "asdf") at any valid location of choosing

Actual Results:  
Project is being saved as *.exr

Expected Results:  
Project should be saved as *.kra by default