If you would like to set windows vista back to handle zip files again you should ensure that the key in the registry looks like this: [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.zip] [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.zip\OpenWithList] "a"="ieuser.exe" "MRUList"="a" [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.zip\OpenWithProgids] "CompressedFolder"=hex(0): If any other sub keys are present delete…