Directory path not in print header when drive letter present

I'm using Vim 7.2 on Windows Vista. The print header normally contains the directory path when the directory path is included in the filename being edited (example: a\b\c\mypgm.pl). When the drive letter "c:\" is included in the directory path (c:\a\b\c\mypgm.pl), only the base filename (mypgm.pl) is printed in the header. Is this a bug or a feature, and is there any way to get the entire path (including drive letter) to print in the header?
TIA
Roy Fulbright
Vim Hacker in Washington DC

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