Good comments.
Instead of something like: C:\Program Files\FooBar v1.23, I use personally would use: C:\Program Files\FooBar v1_23. However not all folks think that way. True.

Having said that, I am a supporter of using readdir(). Having been burned a few times with different versions of glob(), I use readdir() for all production code. I do sometimes use glob() for short tests where my code is just looking in the current dir for specific ".suffixes".