>>The forecolor is stored in PenRed, PenGren and PenBlue fields, background in FillRed, FillGreen and FillBlue fields the same way as it used in RGB() function. The default color is represented by -1 in those fields. You may want to change it for report objects with ObjType: 5-Label, 6-Line, 7-shape and field-8.

You'll find more details about the innards of the FRX files in two "reports" in your FileSpec directory. Mine are C:\Program Files\Microsoft Visual FoxPro 8\Tools\Filespec\60frx1.frx and 60frx2.frx.