I triple checked but yes, CHOOSECOLOR.hInstance is an HWND...
[wine] / DEVELOPERS-HINTS
2000-12-02  Francois GougetFixed the case of "Winelib".
1999-12-05  Eric PouechFixed some errors (thanks to F Gouget for reporting...
1999-10-31  Eric PouechAdded explanation on creating a new DLL.
1999-07-18  Jim AstonUpdated documentation to reflect renamed header.
1999-06-05  Klaas van Gend- more up-to-date description of source tree
1999-02-26  Alexandre JulliardUpdated for new naming conventions.
1998-11-22  Douglas RidgwayMiscellaneous small fixes.
1998-04-13  Alexandre JulliardRelease 980413 wine-980413
1998-03-29  Alexandre JulliardRelease 980329 wine-980329
1997-06-29  Alexandre JulliardRelease 970629 wine-970629
1997-06-16  Alexandre JulliardRelease 970616 wine-970616
1997-04-15  Alexandre JulliardRelease 970415 wine-970415
1996-08-18  Alexandre JulliardRelease 960818 wine-960818
1996-07-12  Alexandre JulliardRelease 960712 wine-960712
1996-05-21  Alexandre JulliardRelease 960521 wine-960521
1996-05-06  Alexandre JulliardRelease 960506 wine-960506
1995-10-03  Alexandre JulliardRelease 951003 wine-951003
1995-03-19  Alexandre JulliardRelease 950319 wine-950319
1995-02-16  Alexandre JulliardRelease 950216 wine-950216
1994-12-10  Alexandre JulliardRelease 941210 wine-941210
1994-10-17  Alexandre JulliardRelease 941017 wine-941017
1994-06-15  Alexandre JulliardRelease 940614 wine-940614
1994-04-05  Alexandre JulliardRelease 940405 wine-940405
1994-02-02  Alexandre JulliardRelease 940201 wine-940201