Music Libraries / Folders - Files not shown - WHY

In My Music Library / Music Folders - Itunes has created a lots of folder which i thougth was empty, and could be deleted

But when right clicken on folder properties, it say e.g 2 files - But no files are shown

I have Unchecked Hide Protected operating System files in folder Options.

Why cant i see these files. Pleae look at attached screenshot

The Folder
The Best of 2 unlimited contains 2 files ( 12.288 ) bytes But they are not shown

I have now checked the folder in an FTP Programs - The 2 files are Folder.jpg and AlbumArtSmall.jpg

Now an Sub question / Itunes question - Can this folder be deleted without removing Artwork from Music file ??