The DPAPI keys used for encrypting the user's RSA keys are stored under %APPDATA%\Microsoft\Protect\{SID} directory, where {SID} is the Security Identifier of that user.
用于加密用户RSA密钥的DPAPI密钥存储在%APPDATA%\Microsoft\Protect\{SID}目录，其中{SID}为该用户的安全标识符。