[Geany] Help with custom compiler (2)

[Laszlo Nagy]

I could setup a new filetype for my custom files. Syntax highlight is 
working. But whenever open an SSDL file, I have to manually change the 
file type to "custom file types/SSDL file".

My 'filetypes.ssdl.conf' file has this inside:

[settings]
lexer_filetype=C
extension=ssdl

What else do I need to change to open SSDL files with this file type by 
default?

Thanks,

    Laszlo