I never knew these commands even existed, I always just want to the registry. I wonder which versions of Windows they shipped with, I only have 10 available to test here.
Displays or modifies file extension associations ASSOC [.ext[=[fileType]]] .ext Specifies the file extension to associate the file type with fileType Specifies the file type to associate with the file extension Type ASSOC without parameters to display the current file associations. If ASSOC is invoked with just a file extension, it displays the current file association for that file extension. Specify nothing for the file type and the command will delete the association for the file extension.
Displays or modifies file types used in file extension associations FTYPE [fileType[=[openCommandString]]] fileType Specifies the file type to examine or change openCommandString Specifies the open command to use when launching files of this type. Type FTYPE without parameters to display the current file types that have open command strings defined. FTYPE is invoked with just a file type, it displays the current open command string for that file type. Specify nothing for the open command string and the FTYPE command will delete the open command string for the file type. Within an open command string %0 or %1 are substituted with the file name being launched through the assocation. %* gets all the parameters and %2 gets the 1st parameter, %3 the second, etc. %~n gets all the remaining parameters starting with the nth parameter, where n may be between 2 and 9, inclusive. For example: ASSOC .pl=PerlScript FTYPE PerlScript=perl.exe %1 %* would allow you to invoke a Perl script as follows: script.pl 1 2 3 If you want to eliminate the need to type the extensions, then do the following: set PATHEXT=.pl;%PATHEXT% and the script could be invoked as follows: script 1 2 3
So for the PDF extension you can query using
assoc .pdf which returns
.pdf=AcroExch.Document. Then you can take that file type and run
ftype AcroExch.Document which gives you
AcroExch.Document="C:\Program Files (x86)\Adobe\Acrobat 10.0\Acrobat\Acrobat.exe" "%1".
>assoc .pdf .pdf=AcroExch.Document >ftype AcroExch.Document AcroExch.Document="C:\Program Files (x86)\Adobe\Acrobat 10.0\Acrobat\Acrobat.exe" "%1"
(I still remember parts of my
config.sys days so I changed my prompt using