Exporting difference between two subtitle files

[previousserver]

Let's say I have File1 (full) and File2 (signs & songs), both in ASS format, and I'd like to make a new subtitle file with lines in File1 but not in File2. Simply diff'ing and/or grep'ping the two files breaks the whole structure, so not exactly an option.
Can this be done in SubtitleEdit? I know there's the Compare window but it only exports the differences side-by-side in HTML.

[techguru0]

you can kinda do this with notepad++
but its not the best for sub editing