1. Download http://support.microsoft.com/kb/241396 inside a file called FileTool.exe and decompression, decompression is a VC project, with vc6.0 Open project, compile, get FileTool.dll, copy it to vc6.0 installation directory.
2. Point VC menu bar inside Tools (tool)->customizes (custom)->add-ins and Macro files (add-ons and macros file)
Click Browse, select Type *.dll,
Find just that FileTool.dll file, click OK, the VC interface has more toolbars:
Where O is the button to open the file, a is added to the project button. At this point, we can use the two buttons to open and add the file to the project.
3. Another problem is that it is easy to accidentally press the vc6.0 (Open button) to cause vc6.0 to die. To solve this problem, we point the VC menu bar (Tools)->customizes (custom), then we select the vc6.0 menu bar and pull it to the custom dialog box, so that the open button can be removed. Similarly, the "file-and-open" button and the "Project-to-project--File" button are also removed. Select "Add-ins" in the Category drop-down menu to pull the "O" and "A" buttons to the open and add to the project button where they were just removed. To end the customization, we have basically solved the problem of open error.
vc++6.0 to open File error resolution