I don't use Girder, sorry, but can say that the string works fine when passed through the windows "Run" dialogue, and also works fine when placed in my Logitech keyboard xml files so that MC launches and plays at the press of a button.
I'm not sure how girder passes the command on to MC12.exe, but, if it's any help, I had to wrap from "/play treepath=playlists/playlist" in quotes before it would work in the XML file. ?
Not working for me here with MC 12.0.318. And it doesn't appear to be Girder related. Try the following:
1. Create a playlist that contains a list of items that are easily identifiable: Ex. Radiohead
2. Add items to the playlist
3. Select the "Podcasts" node on the tree
4. Click Start-->Run and enter the following the run textbox
mc12.exe /play treepath=playlists/radiohead
5. Click the OK button. Note that the playlist is not added to Playing Now
6. Click Start-->Run and try wrapping the command line parameters with double quotes
mc12.exe "/play treepath=playlists/radiohead"
7. Again, note that the playlist is not added to Playing Now
But wait, it get weirder. Now try this:
Select the "Images" item in the tree pane and perform steps 4 and 5 above.
Note that the playlist is not added to Playing Now but instead the picture slideshow starts playing. As before, wrapping the command line parameters with double quotes has no effect
Lastly,
Select the "Playlists" node in the tree and perform steps 4 and 5 above.
Now, tracks are added to playing now but they seemingly have nothing to do the the playlist you created in step 1.
I'd really appreciate it if the JRiver folks could confirm that this is a problem.
Steve