hi thanks for the help, so the below code should work for opening nzb files with newsbin too? ;Enable newsbin to open nzb files [HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.nzb] "Application"="nbpro.exe" [HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.nzb\OpenWithList] "a"="Explorer.exe" "MRUList"="ba" "b"="nbpro.exe" [HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.nzb\OpenWithProgids] "Newsbin.Document"=hex(0):