SwEx.AddIn framework provides functionality for handling the data (both serializing and deserializing) in SOLIDWORKS 3rd party storage and store.

Refer Data saving in the 3rd party storage using SOLIDWORKS API for detailed overview of 3rd party storage and store.

It is recommended to use this functionality in conjunction with Documents Management by overriding the OnLoadFromStream, OnSaveToStream, OnLoadFromStorageStore, OnSaveToStorageStore methods.