The language is here:
https://github.com/k-john-gough/gpcp
You could find the preference there, too.
Currently Geany only supports Pascal's .pas source file but not Component Pascal's .CP source file.
You can edit the `filetypes_extensions.conf` file yourself `Menu->Tools->Configuration Files->filetypes_extensions.conf` to add `.cp` to the Pascal extensions.
Closed #2806.
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