The path to look for filetypes files mentioned in ```filetypes.README``` is ```/usr/share/geany```. This is not correct for Ubuntu. Under Ubuntu the path is ```/usr/local/share/geany```.
It should be considered to mention both pathes (or even more if known for other linux distributions). So I suggest to extend the text in the README file.
I did not check because I am not using Windows at home but is the README file the same for windows? It will also have a different path of course.