mkvextractgui with AVC problem

[Szymus]

Sorry if this has been asked before, but Im having a problem using mkvextract. When I choose the video track I get a message that says "New Format Detected. (V_MPEG4/ISO/AVC) is an unknown format for mkvextractgui, so please, writet the output extension that will be associated to this type of tracks." I dont know what extension to enter. Ive tried a few different extensions and it always says video extracted, but there is never any file. I have the CoreAVC pro codec installed, is this an acceptable codec? Do I need to put anything in the mkvextract directory?

[Ai Haibara]

Are you sure you're using the latest versions of mkvtoolnix and MKVExtractGUI, and that both are installed to the same directory?

[Szymus]

No I didnt have the mkvtoonix in the same folder.. guess that would help.. Thanks for the help, Ive never messed around with mkv before, so this is all kinda new to me..