These properties refer to the summary information of a MSI package:

Property NameDescription
PATCHNEWPACKAGECODEContains the revision number written in the package summary information.
PATCHNEWSUMMARYCOMMENTSContains the comments written in the package summary information.
PATCHNEWSUMMARYSUBJECTContains the subject written in the package summary information.