Files that contain the .rd file extension are most commonly associated with Macromedia's Captivate software application.
Captivate is a software program that allows users to record activity that is being conducted within a specific application. The software then allows the users to add text, animations and audio to the activity recordings.
The program is often used to create software training demonstrations, allowing users to watch step-by-step instructions showing how an associated software application works.
The RD files that are used by the Captivate program contain the finished Captivate files that are distributed to the end user.
The .rd file extension is also used for reaction data files.
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If you have additional information about the RD file format or software that uses files with the RD suffix, please do get in touch - we would love hearing from you.