A few versions back I added in some functionality to my plugin, eShop, for users to view their orders. I called the file user.php. A lot of my other files have a preface of eshop_ in them. Now at the time I thought nothing of doing this, thinking the naming was suitable. Turns out it was, but caused major grief for IIS users.
ensure it does what it is supposed to, and isn’t over engineered with useless crap. All I did was look for a simple function to create a WordPress query, gave up and used my own, a smaller and better one in the end.
I only looked because the query was something I couldn’t get at very easily to see if anything was going wrong. Time to start having faith in my skills I think.