Cygwin /usr/bin/stat returns "Birth: -", which value in FILE_BASIC_INFORMATION.CreationTime causes that?

[Martin Wege]

Hello,

I have problems with debugging, so a quick help would be appreciated,
as I cannot figure this out after several hours of digging.

Cygwin /usr/bin/stat returns "Birth: -" for some files. Which value
must the CreationTime member of FILE_BASIC_INFORMATION have to cause
/usr/bin/stat ti return "-"? 0, -1, or something else?

Thanks,
Martin