RESTORED to original question as well as I could, 7/27/19 1:08 PM
I've created the following .reg file to add a shell verb 'Build PGL File' for .pgl files. The verb should run Firefox with a command line.
After double-clicking this .reg file, the keys and values are merged into the Registry. But right-clicking a .pgl file in File Manager shows a 'Build PGL File' verb that has no file association.
Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.pgl] @="PGLFile" [HKEY_LOCAL_MACHINE\SOFTWARE\Classes\PGLFile] @="PGL Document" [HKEY_LOCAL_MACHINE\SOFTWARE\Classes\PGLFile\shell] [HKEY_LOCAL_MACHINE\SOFTWARE\Classes\PGLFile\shell\Build] [HKEY_LOCAL_MACHINE\SOFTWARE\Classes\PGLFile\shell\Build\command] @="firefox.exe doit.php?%1%"