HKEY_PERFOMANCE_DATA, HKEY_CURRENT_CONFIG, HWND_TOP, HWND_BOTTOM, HWND_TOPMOST, HWND_NOTOPMOST added as proposed in comments marked xxx. Refs: #23.
REG_QWORD added with a warning comment.
Other comments marked xxx deleted.
SetFilePointerEx added as proposed in a comment.

Signed-off-by: Josef Templ <josef.templ@gmail.com>