This is just a place holder for the modifications I have made to MKVExtractGUI2.
You can download the original version of MKVExtractGUI2 here: https://sourceforge.net/projects/mkvextractgui-2/
I like it a lot but can you just add support for .WEBM format? - only for the program to accept it on input, cause i know it can handle this format. This would save the hassle of renaming .WEBM to .MKV and then adding it to the program... And if it's possible to add multiple files in the program and then extract in a single click.... ;] ... that would be monsterific!!