Everyday I upload some files to my website and to simplify my website operations, I use the same filename and just upload a file with new information every day. The case of file extensions is of no consequence to Windows 7, but it matters to my website. I want to standardize on one case and it doesn't matter which as long it's the same all the time. I have one app, the snipping tool, which seems to generally make files using uppercase, but I have some existing files that are lower case. I have tried to get rid of the lower case extensions by deleting the file and then recreating it with the same name. When I do, Windows changes the case from upper to lower. If I simply create a brand new file with no previous instances of that file in existence (as far as I know), then the default case is upper. How does one go about converting all existing files of a particular type to a standard file extension case, be it upper or lower.