#include <Arduino.h> and #include <arduino.h>

I'm new to arduino but I have discovered that some of the libraries using the IDE use upper or lower case A for arduino.h and so fail to compile.
I'm using win10 and the example I'm trying to use is Radio
it includes arduino.h not Arduino.h so i cant use it.

Is there a way round this?

Change the include to spell the file name correctly.

Post a link to where you got the library from and I'll try to get the bug fixed. Please use the chain links icon on the toolbar to make it clickable. Or if you installed it using Library Manger (Sketch > Include Library > Manage Libraries) then say so and state the full name of the library.

Is there a way round this?

If you have a text editor, yes. If not, you'll need to contact the library author and have them use their text editor.