Syntax default.pgp

While trying to port some things from AutoCAD to BricsCAD I ran into the a problem. BricsCAD doesn't seem to like the lines starting with PLAYOUT in default.pgp:
...
NOTEPAD,         START NOTEPAD,   1, *File to edit: ,
PLAYOUT1,        CADCHUP.EXE PLAYOUT1, 4,,
PLAYOUT2,        CADCHUP.EXE PLAYOUT2, 4,,
SH,              ,                1, *OS Command: ,
...

The result is the default.pgp defaults indeed, killing all settings and presenting a new - out of the box - default.pgp. So I learned to make a backup.

Bottom line is that I really need this line to work, it should pause BricsCAD (value 4), runs cadchup.exe with argument playout[1|2] and after finishing resumes BricsCAD running the rest of the commands under the button.

Being more precise: cadchup.exe generates is script which is fed back to BricsCAD, a menu item looks like

[_Button("PLAYOUT Paper Setup", "004.bmp", "004.bmp")]^C^Cplayout1;script;playout1.scr;playout2;script;playout2.scr;

Any suggestions on how to make this working?