open app directly in Bluestacks

Usually, you should open bluestacks first then open apps.

Using shortcut can let you open app directly, even run it from command.


Step 1. find "My Apps" path, default path is in
C:\ProgramData\BlueStacks\UserData\Library\My Apps

Step 2. double right-click th app shortcut.

If you want to run the app from command, the command is:
C:\ProgramData\BlueStacks\UserData\Library\My Apps\YOURAPP.lnk

for example:
C:\ProgramData\BlueStacks\UserData\Library\My Apps\Facebook.lnk



Reference:
Using Bluestacks to run an android app directly from Windows command line or Desktop Shortcut
http://superuser.com/questions/739747/using-bluestacks-to-run-an-android-app-directly-from-windows-command-line-or-des