Hi Fleur,

As far as I know, .ifo files don't actually contain any audio or video themselves as such - they are more like an instruction sheet telling your computer where on a dvd the audio and video is, to play it back.

I'm guessing the video of your performance was on a DVD from a camcorder of some form? In which case, you need a program which can take the dvd and make a .mpg, .avi (or similar) file. A free DVD ripper which fits the bill is Download Free DVD Ripper - Freeware Download List - your OH may have some luck with it if it's too complicated, but from a quick look at the program you need to just pop the dvd in, point the program to the dvd using the 'Open DVD' button (or possibly point it to the .ifo with the "ifo" button), tell it where you want to put the resulting file with the "Output" button and hit 'start encoding'.

Of course, all completely irrelevent if it's not a dvd you've been given...