Static extern uint AssocQueryString(AssocF flags, AssocStr str, string pszAssoc, string pszExtra, pszOut, ref uint pcchOut) Here's a powershell implementation as he mentioned mostly derived from this: $Signature = System Therefore the results of the ftype command therefore are not usuable to determine which application is associated with a specific file extension.Īs mentioned by Eryk Sun, you can get it with AssocQueryString. It reads the HKCR\htmlfile\shell\open\command\(Default) registry key and prints out the result. The ftype command however is not aware of the above registry key. If the hash is invalid, windows will reset the user choice to the default application. The correct Hash value proves that the UserChoice ProgId value was set by the user, and not by any other application. The key contains a Prog-Id and a Hash Value. Therefore a new registry key was introduced and Windows now writes the user choice to HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\\UserChoice This probably was due to security reasons and trouble with applications hijacking file type associations. This is due to the fact that Microsoft decided in Windows 8 that users should be able to set default programs only via the built in GUI. It seems that ftype and assoc are pretty useless on systems running Windows 8 or later.
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