This lets you open links in mirc with any program you choose. So there is no need to change the default browser to get mirc to use another program for opening links.

Usage:
Simply load the script, then you’ll be prompted to select a file. Select the program you wish to open links with. Then start clicking links.
That’s it!

Notes:
If the program selected doesn’t exist when you click a link (program deleted or moved) you’ll be prompted to select a new program or to use the default program.