Camtasia 9 and Camtasia Mac 3 and later
Camtasia on PC and Mac now save to the same .tscproj format. This allows projects created in Camtasia 9 and 3 to be transferred back and forth.
However, not all media files and effects work across platforms. Additionally legacy callouts and captions are not cross platform compatible. For additional information on cross platform projects please see here.
Camtasia Studio 8.4.0 to 8.6.0 and Camtasia for Mac 2.8.0 to 2.10.7
Camtasia on PC and Mac now record to the .TREC format. These .TREC files can be editing on both products. For example, you can record a .TREC file on the PC and edit it on the Mac. You can record a .TREC on the Mac and edit it on the PC. Here is a helpful video to help with moving TREC files from the Mac to PC.