PDP++ worked fine on Win 2000, but on my XP machine it fails with: leabra++> c:\WINDOWS\gzip.exe: *** Couldn't reserve space for cygwin's heap (0x1 050000) in child, cygheap, Win32 error 487 File: ./chapter_6/fsa.proj.gz could not be opened for reading or is empty Even after I set the registry entry to 512MB (I have 1GB RAM). Any ideas? :o( -Roberto Olivares