Captivate2019 - cached projects folder

Personally, I recommend you leave the Project Cache alone and don't delete anything in there until you reach the end of a major milestone in your project, or the end of the project itself.   Once you have delivered your project and you have confirmed you have perfectly good working final version CPTX files stored safely in a repository, THEN you can safely delete your cache.  Thats the process I follow.

If a project happens to become corrupted for some reason, the cache files can be very useful in rescuing the content and restoring a working CPTX project file from the cache.   Additionally, you should always have backups turned on in Captivate Preferences.  And for another layer of projection, I even do an immediate Save As each day when I open my CPTX project file and append the current date to the end of the filename in reverse order (e.g. 2021-11-10 for today).  That means I have at least three ways to get back a working file if something happens to go wrong with it.  In practice this might happen to me once every few years because I never take risks and only work on local files, not over any kind of network connection.  But I like to play safe.

However, as Lieve has mentioned, the name of each cache folder is of no help whatsoever in determining which particular project file that cache folder relates to.  That's why the dcache AIR app is handy. It can tell you which folders relate to which projects.