This article was previously published under Q199039
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When a resource is deleted, the resource ID remains in the Resource.h file. This could cause problems, such as duplicate IDs or a deleted resource that is displayed at runtime using the old ID. The compiler does not flag the unassigned resource IDs.
Open the resource header files, and delete the ID definitions for all resources that have been deleted from the resource script. Also, verify that your code is not referencing these deleted IDs.
Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article.
Steps to Reproduce Behavior
Create an MFC AppWizard (exe) project.
Insert three dialog resources.
On the File menu, click Save All. This updates the Resource.h file with the new IDs.
Delete the dialogs in the Resource Editor.
On the File menu, click Save All.
Open the Resource.h file in Visual C++.
RESULT: The three dialog resource IDs are in the Resource.h, even though they have been deleted from the resource script.