Check out some options how trec files might be converted to mkv format.
Camtasia Studio screen recording software can exports its own recordings (.trec) to several other multimedia formats - including the common AVI, or MP4, which can then be converted to MKV using for example any of the mp4 to mkv video converters.
Unfortunately, there is no detailed software record in the database for this conversion.
Additional links: Open trec file, Open mkv file
TREC
Files with trec extension can be commonly found as recorded screen videos made with the Camtasia Studio. Usually used to capture what someone is doing on his computer.
MKV
Files with mkv extension are videos in the open source Matroska Multimedia Container format. You can open it and play it with pretty much every multimedia player.
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