Using the new FWH 11.07 and xHarbour commercial to compile testfx1.prg I get the following error.
xLINK: error: Unresolved external symbol '_GetWindowLongPtr referenced from Fivehcm.lib(FWGIF.obj)'.
xLINK: fatal error: 1 unresolved external(s).
Type: C >>>Couldn't build: testfx1.exe<<<
