Interestingly enough, file extensions are the norm on the Mac, too, but Apple prefers to hide them in OS X, because, you know, Apple. If you don’t have any money to devote to an expenditure that reminds you of Microsoft and the 1980s, try ManageNameExt. Go ahead. It’s free.
What you get for your trouble is a Mac utility that lets you manage the name and extension of files. Big whoop, right? Wait! There’s more! ManageNameExt is aimed at extensions but also lets you rename a bunch of files, alter the prefix and suffix (and why is there only one ‘f’ in prefix, but two ‘f’s in suffix?), add numbers, replace characters during the rename process.
Not bad for free, huh? And it’s relatively simple to setup and use.
Use ManageNameExt to rename a folder of files and manipulate the names just about any way you can think of from upper and lower case, replace characters, even modify the file modification date (that really messes with NSA spooks as they rifle through your Mac’s files; and you know they’re doing that while you sleep, right?).
Mac users can choose from a number of utilities which rename files and modify extensions, but few are free and easy, and ManageNameExt is both.