What's the actual windows media player maximum banner width?

Question

When looking at the documentation for the banner tag in windows media metafiles all the documentation says there is a maximum size of 194 x 32 pixels.

http://msdn.microsoft.com/en-us/library/dd562478(v=VS.85).aspx

However, when experimenting with larger images they seem to be displaying correctly. Is there some real undocumented limitation here? Will it get cut off on different/older versions?