Microsoft Knowledge Base Article 327931 contains the following summary:
This article describes how to use the Set Program Access and Defaults feature. This feature was originally introduced in Service Pack 3 (SP3) for Windows 2000 Professional, and is also included with Service Pack 4 (SP4) for Windows 2000 Professional. This information is intended for advanced users and IT professionals.
Note Programs must register to appear in Set Program Access and Defaults. For information about how software vendors can register their programs, visit the following Microsoft Web site: