FileMerge: This file type cannot be merged.

Question

FileMerge.app fails with an odd message:

This file type cannot be merged.

when I try to save successfully merged text files, which definitely can be merged.

(I invoke FileMerge from git using opendiff tool on OS X 10.6.3, but problem happens even when I select files to merge manually)

Why is it happening? How can I avoid this problem?

Answer 1

I've found cause: I've had invalid entry in FileMerge → Preferences → Filters.