I know I can use properties of $sound() to get ID3 information from an MP3, but I'm looking for a DLL that will write ID3 tags (v2+) to files. There's got to be one that exists somewhere :\
Then I'm afraid you'll have to use other program like Winamp. I really did my best, but couldn't find a script nor mIRC DLL or a Windows-based command-line tool that supports ID3v2.