The function SysQueryClassList()

The function <SysQueryClassList does not work after resetting the WPS 
(with RESETWPS.EXE from WPTOOLS, for example). 

A possible workaround for this problem is to open a new OS/2 session and 
issue the <SysQueryClassList from within this session. This workaround may 
not be effective in every situation. 

This bug seems to be fixed in WARP 4. 

Source: Christian Langanke (see EMail Addresses)