Have anyone ever tried using the linkage specifier

extern "C"

in Visual C++ 5.0 or 6.0?
I have got the following error

error C2059: syntax error : 'string'

when using the above linkage for Visual C++ 5.0. The linkage worked for Visual C++ 6.0 on the very first time only (such a let down...). Is it a bug or what? Thanks in advance...