Especially our testing data in ../MITK-build/CMakeExternals/Source/MITK-Data contains lots of old data sets in the *.pic or *.pic.gz format which should be replaced by *.nrrd.
We should also make sure that our documentation does not contain unnecessary pic-files. One should use a "git grep" to double that everything unnecessary was removed. In addition, our test protocols for the releases should be adapted to use the new format.
Since we officially replaced the pic-format a long time ago I put this bug to "major" severity and "high" importance. Very easy to do.