Program: MKV Toolnix
License: GPL v2
Description: With these tools one can get information about (mkvinfo) Matroska
files, extract tracks/data from (mkvextract) Matroska files and create
(mkvmerge) Matroska files from other media files. (taken from readme)
Other: Already has 32 bit and 64 bit portable versions of the app for windows in their website.
EDIT: Sorry, saw request guidelines after submiting the post.