Thank you, fair enough.
If you do get around to it, there is an easier way to do it, instead of combing through all the code.
When an image is not capitalized correctly, RPGM will halt with an error message that explicitly tells you which image is missing. (which you can then resolve by changing the capitalization yourself and then click on "retry" button to continue playing)
So the simpler solution is to just export it into linux with a warning specifically for a volunteer playtester.
said playtester can give you a list of the specific images which have capitalization issues. which they will find as they play the game. And be able to easily resolve for self use via the rename + retry button method.