If you ever need to change the case of a lot of file and/or folder names in Windows I can recommend Case - a Freeware component of Febooti's shareware 'FileTweak' utility.

It will be particularly useful if you have ever developed websites on Windows 98, which had a nasty habit of CAPITALISING some file and folder names when de-compressing Zip archives for example.

Unlike an FTP 'change-to-lower-case' option, you can be selective about the conversion and it will include sub-folders.

Saved an awful lot of work for me today while updating a legacy project.