【error】cannot open file "mfc42.lib"

解决办法：将该文件拷贝到VC的安装目录/VC98/MFC/Lib，然后进行如下设置：

1) You'll need to have a copy of Visual Studio 6.0 or a copy of the Visual Studio 6.0\VC98\MFC\Lib directory.

2) Tools -> Options

a. If you don't see Projects and Solutions, check Show all Settings

b. Click Projects and Solutions.

c. Click VC++ Directories

d. Show directories for: Library Files

3) Add the path to your Visual Studio 6.0\VC98\MFC\Lib directory.

This will allow you to link to VC6.0 library items.