Can't remember the proper name...

OK. So basically, I 'had' a program before where you could change the format of a vid file to a different format. Example...my friend is sending me some vids that are save into some kind of Apple software format. I want to make it a .WMV format. I had a program that changed this for me. But I can't remember the proper term for it. So now I can't google it and find a download lol. See my problem? It's at the tip of my tongue...but I just can't seem to remember the proper term for this for the life of me. Does anyone here know what I'm talking about? LOL

 

Online converters can also be useful. These are good: Media Convert and Media Converter