Sent to a WIMMessageCallback function to indicate that an image has been mounted to multiple locations. Only one mount location can have changes written back to the .wim file.
WIM_MSG_IMAGE_ALREADY_MOUNTED wParam = (PWSTR) pszFullPath; lParam = (DWORD) 0;
[in] A pointer to a null-terminated string containing the full file path of the existing mounted image.
Your routine must return WIM_MSG_SUCCESS.