Official downloads for the full Windows CE 5.0 Platform Builder have been retired by Microsoft as of September 30, 2022 . While you can still find related components like the Standard SDK Feature Packs

Ensure your user account has explicit write permissions to the C:\WINCE500 directory tree. Connection and Debugging Issues

Even though Microsoft has shifted to newer embedded technologies, many legacy systems still rely on this platform. 1. Understanding the Role of Platform Builder 5.0