LOCALE_IREADINGLAYOUT

Windows 7 and later: The reading layout for text. Possible values are defined in the following table.

Value Meaning
0 Read from left to right, as for the English (United States) locale.
1 Read from right to left, as for Arabic locales.
2 Either read vertically from top to bottom with columns going from right to left, or read in horizontal rows from left to right, as for the Japanese (Japan) locale.
3 Read vertically from top to bottom with columns going from left to right, as for the Mongolian (Mongolian) locale.