This post will help you if you are not Administrator or Seven failed to grant you (it's happen sometimes). So on
this solution is the best one :1. Copy AxCmd.exe from C:\Program Files (x86)\Alcohol Soft\Alcohol 120 to root of your DVD iso directory, for example : G:\Video\DVD. It must be a public directory.
2. Create a new file called Mount.bat with :
call G:\VIdeo\DVD\AxCmd.exe 1: /m:%1
3. In JRiver / Tools / Options / File Types / Disk Images Files (iso,..) choose
Playback method => External Program (custom)
Program => where you create the Mount.bat file and copy the AxCmd.exe (eg : G:\Video\DVD\Mount.bat)
Arguments => "[Filename]"
That's all folks
PS : to debug if something is going wrong use this, in Mount.bat :
call G:\VIdeo\DVD\AxCmd.exe 1: /m:%1
cmd.exe /k
The command box will remain with the error message. It's a bastard way to debug, but it works