2.2.2 Package Version Storage

Package versions are contained in storage subcontainers that are within the package container. A version of a package is accessed by finding the version entry in the VersionDirectory directory stream and then opening the storage subcontainer that is in the package container that has a name that consists of the word "Version", plus the storage number, which is expressed as an eight-digit number with leading zeroes.<1>

The data format of the persisted stream consists of a 32-bit length field followed by a format stream [MS-CFB] that represents the substorage or substorages.