Forums Scripts & Popups Warning: the editor is unable to display the whole

I am running mIRC 7.22 under WINE in Ubuntu 11.10 When I open the scripts editor, I get this message:

Warning: the editor is unable to display the whole of file:
script.ini
You should click the Cancel button in the Editor to avoid losing the end of this file.

When I scroll to the bottom of edit window, the file is indeed truncated. I then click on "cancel" to exit to prevent any changes. How do I fix this problem? Can I set mIRC to use an external editor?

Thanks, John-Eric