The CONFIG.BIN resource specifies the default system colors (as well as several other OEM-specific values). For Windows 3.1, the recommended default system color values for 16- and 256-color displays are new. In particular, several system colors that were patterned (dithered) in Windows 3.0 have been changed to solids to improve performance and visibility for interlaced displays.
In Windows 3.1, the CONFIG.BIN resource has been expanded to include the clrInactiveCaptionText member. This member specifies the color of the text in the title bar of an inactive window.
For more information and a complete description of the default system colors and the clrInactiveCaptionText member, see the Microsoft Windows Device Driver Adaptation Guide.