What is volumelcon.icns Can someone tell me what volumelcon.icns is?  I'm attempting to remove unnecessary items from File Explorer and don't want to remove something that is required.
.VolumeIcon.icns is an invisible file which holds the display icon for each attached disk.
If you delete it - not worth it as it's only about 1MB anyway - it will simply be re-created.

As a general rule - if it's invisible… leave it alone.
BTW, Mac doesn't have a 'file explorer' it has Finder.