The file filter information is being stored in the *.uniflash session file. This can impact cases where a session file is created using an older UniFlash version that does have a information for newer extensions like *.mcelf. Then when this file is opened in a newer UniFlash version that does, the default file filter information is overridden by the older information in the session file.

Unless there is a specific need to have this information in the session file, it should be removed.