Shortcut made by Visual Studio Installer has no working dir

I try to deploy a VB app with Visual Studio Installer with a connected .chm file installed in same dir. The user may choose another location than the default to install the application during the installation process and that works fine. The shortcut that is created on the desktop works allright but the chm file cannot be opened from within the vb application, since the field: working directory in the shortcut is empty.
Can someone advise me how to handle that this field is filled with the same value as the dir where the app is created in.
Thanks in advance, Dashbully