Overview: This help article assists with fixing the No Open Command Found error within HowNow when opening certain file types.
Here is an example of what the error looks like:
We strongly recommend having your IT department making the below changes.
If you are experiencing the No Open Command Found error or similar, below is the corresponding registry snippet below and save it into a .reg file to be run on the computer having this issue. Your IT may also also have to grant permissions to make the necessary changes to your machines registry.
NOTE: Before you make any changes to the registry, always make sure to make a backup in case anything goes wrong.
PNG file type (windows photo viewer)
Windows Registry Editor Version 5.00 [HKEY_CLASSES_ROOT\pngfile\shell\open] "MuiVerb"="@%ProgramFiles%\\Windows Photo Viewer\\photoviewer.dll,-3043" [HKEY_CLASSES_ROOT\pngfile\shell\open\command] "(Default)"=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,\ 74,00,25,00,5c,00,53,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,72,\ 00,75,00,6e,00,64,00,6c,00,6c,00,33,00,32,00,2e,00,65,00,78,00,65,00,20,00,\ 22,00,25,00,50,00,72,00,6f,00,67,00,72,00,61,00,6d,00,46,00,69,00,6c,00,65,\ 00,73,00,25,00,5c,00,57,00,69,00,6e,00,64,00,6f,00,77,00,73,00,20,00,50,00,\ 68,00,6f,00,74,00,6f,00,20,00,56,00,69,00,65,00,77,00,65,00,72,00,5c,00,50,\ 00,68,00,6f,00,74,00,6f,00,56,00,69,00,65,00,77,00,65,00,72,00,2e,00,64,00,\ 6c,00,6c,00,22,00,2c,00,20,00,49,00,6d,00,61,00,67,00,65,00,56,00,69,00,65,\ 00,77,00,5f,00,46,00,75,00,6c,00,6c,00,73,00,63,00,72,00,65,00,65,00,6e,00,\ 20,00,25,00,31,00,00,00 @="%SystemRoot%\\System32\\rundll32.exe \"%ProgramFiles%\\Windows Photo Viewer\\PhotoViewer.dll\", ImageView_Fullscreen %1" [HKEY_CLASSES_ROOT\pngfile\shell\open\dropfile] "Clsid"="{FFE2A43C-56B9-4bf5-9A79-CC6D4285608A}"JPG file type
Windows Registry Editor Version 5.00 [HKEY_CLASSES_ROOT\jpegfile\shell\open] "MuiVerb"=hex(2):40,00,25,00,50,00,72,00,6f,00,67,00,72,00,61,00,6d,00,46,00,\ 69,00,6c,00,65,00,73,00,25,00,5c,00,57,00,69,00,6e,00,64,00,6f,00,77,00,73,\ 00,20,00,50,00,68,00,6f,00,74,00,6f,00,20,00,56,00,69,00,65,00,77,00,65,00,\ 72,00,5c,00,70,00,68,00,6f,00,74,00,6f,00,76,00,69,00,65,00,77,00,65,00,72,\ 00,2e,00,64,00,6c,00,6c,00,2c,00,2d,00,33,00,30,00,34,00,33,00,00,00 [HKEY_CLASSES_ROOT\jpegfile\shell\open\command] @=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,\ 00,5c,00,53,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,72,00,75,00,\ 6e,00,64,00,6c,00,6c,00,33,00,32,00,2e,00,65,00,78,00,65,00,20,00,22,00,25,\ 00,50,00,72,00,6f,00,67,00,72,00,61,00,6d,00,46,00,69,00,6c,00,65,00,73,00,\ 25,00,5c,00,57,00,69,00,6e,00,64,00,6f,00,77,00,73,00,20,00,50,00,68,00,6f,\ 00,74,00,6f,00,20,00,56,00,69,00,65,00,77,00,65,00,72,00,5c,00,50,00,68,00,\ 6f,00,74,00,6f,00,56,00,69,00,65,00,77,00,65,00,72,00,2e,00,64,00,6c,00,6c,\ 00,22,00,2c,00,20,00,49,00,6d,00,61,00,67,00,65,00,56,00,69,00,65,00,77,00,\ 5f,00,46,00,75,00,6c,00,6c,00,73,00,63,00,72,00,65,00,65,00,6e,00,20,00,25,\ 00,31,00,00,00 [HKEY_CLASSES_ROOT\jpegfile\shell\open\DropTarget] "Clsid"="{FFE2A43C-56B9-4bf5-9A79-CC6D4285608A}" BMP file type (windows photo viewer)
Windows Registry Editor Version 5.00 [HKEY_CLASSES_ROOT\Paint.Picture\shell\open] "MuiVerb"="@%ProgramFiles%\\Windows Photo Viewer\\photoviewer.dll,-3043" [HKEY_CLASSES_ROOT\Paint.Picture\shell\open\command] "(Default)"=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,\ 74,00,25,00,5c,00,53,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,72,\ 00,75,00,6e,00,64,00,6c,00,6c,00,33,00,32,00,2e,00,65,00,78,00,65,00,20,00,\ 22,00,25,00,50,00,72,00,6f,00,67,00,72,00,61,00,6d,00,46,00,69,00,6c,00,65,\ 00,73,00,25,00,5c,00,57,00,69,00,6e,00,64,00,6f,00,77,00,73,00,20,00,50,00,\ 68,00,6f,00,74,00,6f,00,20,00,56,00,69,00,65,00,77,00,65,00,72,00,5c,00,50,\ 00,68,00,6f,00,74,00,6f,00,56,00,69,00,65,00,77,00,65,00,72,00,2e,00,64,00,\ 6c,00,6c,00,22,00,2c,00,20,00,49,00,6d,00,61,00,67,00,65,00,56,00,69,00,65,\ 00,77,00,5f,00,46,00,75,00,6c,00,6c,00,73,00,63,00,72,00,65,00,65,00,6e,00,\ 20,00,25,00,31,00,00,00 @="%SystemRoot%\\System32\\rundll32.exe \"%ProgramFiles%\\Windows Photo Viewer\\PhotoViewer.dll\", ImageView_Fullscreen %1"
MP4 file type (windows 11 windows media player)
Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOT\.mp4]
@="WMP11.AssocFile.MP4"
"Content Type"="video/mp4"
"PerceivedType"="video"
[HKEY_CLASSES_ROOT\.mp4\OpenWithProgids]
"AppXcezf6bjsrpbyaqwyjdehhb46y5e5mm3a"=hex(0):
"AppXqj98qxeaynz6dv4459ayz6bnqxbyaqcs"=hex(0):
"AppXvsqkg1th80rv6s2rkh5m1hjp3hxryydd"=hex(0):
"WMP11.AssocFile.MP4"=hex(0):
[HKEY_CLASSES_ROOT\.mp4\ShellEx]
[HKEY_CLASSES_ROOT\.mp4\ShellEx\{BB2E617C-0920-11D1-9A0B-00C04FC2D6C1}]
@="{9DBD2C50-62AD-11D0-B806-00C04FD706EC}"
[HKEY_CLASSES_ROOT\.mp4\ShellEx\{e357fccd-a995-4576-b01f-234630154e96}]
@="{9DBD2C50-62AD-11D0-B806-00C04FD706EC}"