Files that contain the .cxt file extension are most commonly associated with the Adobe Director (previously Macromedia Director) multi-media authoring application. CXT files contain Director cast or object files that have been saved in a protected file format.
The CXT file format prevents the Director files from being edited and allows objects to be shared without the risk of being modified. When a user opens a Director file that is already open, a CXT copy of the file is automatically created, preventing the user from making edits to the locked copy of the file. When the file is closed, the copy is automatically deleted.
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If you have additional information about the CXT file format or software that uses files with the CXT suffix, please do get in touch - we would love hearing from you.