e upgrading to version 1.11 my world won't load in

I was playing MC last night 11/25 1:04AM MST. When I fired it up this morning - it upgraded to 1.11 version. and will not "see" or "find" my World3.

C:\Users\BARCAI\AppData\Roaming\.minecraft\saves\World3

Nothing I have done seesm to work to be able to fidn the world folder - please help, I have had this world since 2010. It is the only map I had.