To anyone building Kicad rev 4793 you will get this error when running cvpcb, eeschema, pcbnew, gerbview, pcbcalculator or pl_editor:
You need to manually copy:
"kicad-winbuilder-3.3\build\Release\cvpcb\_cvpcb.kiface"
"kicad-winbuilder-3.3\build\Release\eeschema\_eeschema.kiface"
"kicad-winbuilder-3.3\build\Release\gerbview\_gerbview.kiface"
"kicad-winbuilder-3.3\build\Release\pcb_calculator\_pcb_calculator.kiface"
"kicad-winbuilder-3.3\build\Release\pcbnew\_pcbnew.kiface"
"kicad-winbuilder-3.3\build\Release\pagelayout_editor\_pl_editor.kiface"
to your "kicad-winbuilder-3.3\kicad\bin\" folder
EDIT: cvpcb and pcbnew still fail to run