Decided to export the data file from my favorite tool for getting api constants and converted them so they could be used in autoit by simple clicks and paste.
Over 50,000 constants (this is not all the constants available of course).
Files have au3 extension for easy editing, keep the file under 4000 records each.
Add your own files i.e. a file with all your most used constants.
Source Not included with Skinnable version, see Win32 API Constants for source (excluding skin functions)
Edit: Unpacked the UPX exe as it was causing AV false positives (Jon).