%I64u
See: Format Specification Fields: printf and wprintf Functions
http://msdn.microsoft.com/library/en-us/vclib/html/_crt_format_specification_fields_.2d_.printf_and_wprintf_functions.asp
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Greetings
Jochen
My blog about Win32 and .NET
http://blog.kalmbachnet.de/
You need to use %I64u.