I had the problem you talked about but it wasn't due a different file in the system but because the path was wrong.Absolutely no idea what you're talking about here.
gameFolder -> www
| js -> requester.js
| img -> requested.png
For example in requester.js the image requested.png was needed but since the path was to /img/ it never got out the js subdir thus not finding it in its own directory. I don't think there'll be a case where the file will not be found due to case-sensitive stuff, but never say never I guess. On Defenestration and Tail of desire this fix I tried worked tho