I tried to use this solution from official webpage: https://support.microsoft.com/en-us/...0%2C5762329043 . Meanwhle Application Data folder is not visible anyway except I put full path in command line of Windows Explorer. I tried to change permissions for Data.dat (I use Windows xp). But when I change folder properties - to set Make visible hidden folders/files and to clear hide extensions.,when I click apply and OK and when check properties again this changes is not saved. So when I right click Data.dat i just see elementary options - no advanced options, no security tab etc. How can I solve this issues? If i delete Data.dat nothing changes and happens. Can I set correct content of data.dat or download from internet? So how to see advanced settings and security of data.dat, how make visible hidden folders permanently?// this question relates to Excell, Access, Power Point