Can you give me the details of your system, OS, compiler, etc?

My compiler is dated 
>cl /?
Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8168 for 
+80x86
Copyright (C) Microsoft Corp 1984-1998. All rights reserved.

[download]

Visual Studio 6.

are you sure it doesn't support 64 bit integers in any way?

No, I don't know one way or another.

I believe that C99 specifies support for the long long int (64 bits or bigger) type as mandatory

I withdraw my suggestion.

In reply to Re^4: Unpack 64 bit value by ikegami
in thread Unpack 64 bit value by nagalenoj

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