xfce and icewm - window manager configuration file doesn't work

I would like to replace a default xfce windowmanager (xfwm4) with icewm. I have installed the following package using apt: icewm. In the file: `/etc/xdg/xfce4/xfconf/xfce-perchannel-xml/xfce4-session.xml xfwm4 is replaced with icewm. I have created a file winoptions (touch winoptions) in the directory ~/.icewm`. The file contains the following line: testApp1.SimpleGL.geometry: 500x1000+300+0 where testApp1 is a window class and SimpleGL is a window title. A window manager starts but the config file has no effect when I start a defined window. What might be wrong ?