HI! I have your same problem!
I have a yellow Lumia 920 and I have updated it to the GDR Preview 8.1 in May and since then I have found this weird "@C:\Date\Programs\{2377fe1b-c10f-47da-92f3.." in my settings, where extras+info used to be. And if I tap on it, nothing opens!
I have waited before...