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Protected Storage service is used in Windows to store confidential information in a secure, encrypted manner. Data like private keys, IE autocomplete forms and passwords, Outlook Express mail and news passwords and Microsoft Wallet information is all stored in the Protected Storage. Using some undocumented Windows libraries, it is possible to read this data, PStorageLib also gives you a posibility to write your own data into Protected Storage. Encryption is not a problem since the same undocumented functions used to decrypt the data for you themselves.
PStorageLib Demo - shows contents of Protected Storage.
PStorageLib v1.0 - 35Kb (Help file, Library & Demo sources).