Is "XM_CXSMICON" a misspelling of "SM_CXSMICON" in these MSDN pages?

Question

In the three MSDN articles linked at the bottom of this post, the pre-processor macro XM_CXSMICON is mentioned. In context, it is supposed to be the index of the system metric that gives the width of a small icon in the notification tray or on the balloon-popup of such an icon.

Here is a quote, verbatim:

NIIF_LARGE_ICON (0x00000010) 0x00000010. Windows Vista and later. The large version of the icon should be used as the icon in the notification balloon. This corresponds to the icon with dimensions SM_CXICON x SM_CYICON. If this flag is not set, the icon with dimensions XM_CXSMICON x SM_CYSMICON is used.

The other three macros from that quote, SM_CXICON, SM_CYICON and SM_CYSMICON, are all defined in user32.h as expected but no header file in the Windows API defines XM_CXSMICON. Searching the MSDN only returns the hits linked at the end of this post, all of which are related to notify-icons.

With this evidence, I conclude that this is an error and the macro is actually SM_CXSMICON which is defined on the line above SM_CYSMICON in user32.h.

Can anyone confirm this guess or provide further information?

The three MSDN articles in question:

1. https://msdn.microsoft.com/en-us/library/windows/desktop/bb773352(v=vs.85).aspx
2. https://msdn.microsoft.com/en-us/library/windows/desktop/bb774428(v=vs.85).aspx
3. https://msdn.microsoft.com/en-us/library/windows/desktop/ee453691(v=vs.85).aspx

Answer 1

Yes, that is a typo. It should read SM_CXSMICON x SM_CYSMICON.