How to change a blank for underlining?

I very badly know English, I from Russia, excuse
At converting Tag -> File Name
how to аutomatically change (script) a blank (spacebar) for underlining (_)
Tag (artist): Linkin Park
File name: Linkin_Park

Please see the topic How do I replace the string "xyz" in tag-fields or filenames? from the FAQ.

Best regards,
~ Florian

now works
Mp3tag - it's COOL!!! :slight_smile: