I have the same problem. Looks like two buttons are missing in 10.4.
Here is a work around. Clumsy, but it works.
The permissions on the file after down load are 1140 -rwxr-xr-x file.desktop
If I run sudo chmod ugo+rx *.desktop
Now, the permissions are STILL 1140 -rwxr-xr-x file.desktop
But now the file is now executable from the desktop. Strange that I can't see a change in permissions, but running this command seems to make a difference.
I have the same problem. Looks like two buttons are missing in 10.4.
Here is a work around. Clumsy, but it works.
The permissions on the file after down load are 1140 -rwxr-xr-x file.desktop
If I run sudo chmod ugo+rx *.desktop
Now, the permissions are STILL 1140 -rwxr-xr-x file.desktop
But now the file is now executable from the desktop. Strange that I can't see a change in permissions, but running this command seems to make a difference.