It is strongly recommended that you run validation on every new or newly modified installation package before attempting to install the package for the first time.
Package validation includes the following three processes:
Merge modules should be validated by using the method described in Validating Merge Modules.
Evalcom2.dll provides a COM object that implements validation operations for installation packages and merge modules. The main object implements interfaces for C/C++ programs. For more information, see Validation Automation.