Ye they are hardcoded. I don't feel like writing a proper guide so here is the

patch file:

1. Open sro_client.exe with x32dbg
2. Press Ctrl+P and import the *.1337 file.
3. Click Patch file, save it somewhere else and replace your client after closing the debugger.
You need to create an icon in actionwnddata.txt with ActionID 4011.