Hello TonyJ,
So if you open a workspace file (cws) and a project file (prj), you should see some differences. In particular, the workspace file contains the settings that do not affect the way a project builds, such as breakpoints, window positions, tag information, and debugging levels. Also, a workspace can contain multiple projects, and the location to these projects will be included in the workspace file. Build options and source code control options are also stored in this file.
On the other hand, a project file is a list of files your application uses. Hope that clarifies things.
Thanks!