Lib file "unrecognised or unsupported binary format" vs2010

What does it mean when a lib file is in an "unrecognised or unsupported binary format"? I'm trying to create a lib file and for my little engine for my project and this error is halting it back.

Plus how easy is it to create a DLL in GCC, then link the DLL via a static library? Any good tutorial/documentation on that would be appreciated if I can't get visual studio to work. (Plus I'm having issues with the RC, processional edition for students which isn't supporting c++ projects at all.)
This appears to be a duplicate of http://www.cplusplus.com/forum/windows/77666/ .

Imho it belongs in the windows forum anyway, so I would suggest bumping that thread if it drops too low.

All the best,
NwN
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