Lib file "unrecognised or unsupported binary format"

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.)
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