Bulk Rename Utility

Am attempting to run a replace rule:

":" => "_"

'There are no selected items that need renaming'
https://www.loom.com/share/3cf59cb9b71d4f8b8b145835a1d2ed4a

Colon is an illegal filename character (on Windows).

So I'm guessing it is in fact not a colon, but a character that looks like a colon.
So copy that character, from the source file name, & paste that (character) into the Replace: box & see if it then doesn't do what you want?

https://www.compart.com/en/unicode/U+FE55


I created this file with a U+FE55: