I am having a problem linking 'C' lib content in Visual CCOBOL. In the Visual COBOL solution where linking to C libs is being specified, e.g. Links Settings had "diskcopy.lib" specified. When building the solution errors where returned such as: unresolved external symbol _open referenced in function _diskcopy_open.
The words 'open', 'close', 'read' and 'write' in diskcopy.c were not compatible with the latest VISUAL STUDIO 2010 build and have to be amended to '_open', '_close', '_read' and '_write'. Try to rebuild and it should complete without further problems.