Do you mean you recorded a screen capture in Camtasia recorder and you can't open the file (.trec) to play it or to edit it?
After doing a recording, you get a preview window. If you are happy, go to 'save and edit' and Camtasia should open up automatically with the file to edit on the timeline.
If that doesn't work, goto the destination folder where the trec file is saved, click on that and it will open in Camtasia.
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Nemus Amaranthi
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