SYMPTOMS
A custom expression builder is defined with the _getexpr system variable. Pressing the expression builder button next to the "Functions and expressions" text box in the Query Designer causes the following error:
Fatal error. Exception=C0000005
This also occurs if you set _getexpr to a file that does not exist.
STATUS
Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article.
This bug was corrected in Visual Studio 6.0 Service Pack 3.
For more information about Visual Studio service packs, please see the following articles in the Microsoft Knowledge Base:
194022 INFO: Visual Studio 6.0 Service Packs, What, Where, Why
194295 HOWTO: Tell That Visual Studio 6.0 Service Packs Are Installed