Today Stefan Glienke mentioned at Google+ that there are some libraries which still use the binary format for dfm files. This is an issue since it is nearly impossible to recognize the changes in your vcs.
I do remember old Delphi version which only supported the binary format. In the Delphi bin folder you can find the convert.exe tool that converts a dfm file to the text format and vice versa. You can simply drop a dfm file on it.
Stefan mentioned that one if the libs with binaries is Abbrevia so that I converted them to the text format.