As has been said - the best way of handling your own library is to keep it out of the applications folders and in your own set of library folders so that it is not removed etc when the program is removed.
Some of the Windows Explorer settings are to not hidden files nor show extensions for files that have known extensions.
I get this often with the software I support, for those of us that want to know where our files are this level of user protection gets annoying so I always reset it to my preference.
Using Windows Explorer browse to your install folder, at the top left pick “organize” then from that “folder options”.
On the “view” tab select the following needs to be enabled: “Show hidden files, folders and drives”.
And disable this: “Hide extensions for known file types”.
You can also deselect “Hide protected operating system files (recommended)” when searching for files but remember to re enable it later to prevent accidental OS file deletion.
Click on “Apply to folders” at the top to apply to the folder, it should also work on the sub directories then hit OK.