C# Signature:

    [DllImport("crypt32.dll")]
    internal static extern bool PFXIsPFXBlob(
                ref CRYPT_DATA_BLOB pPfx);

VB Signature:

   <DllImport("crypt32.dll", SetLastError:=True)> _
    Public Shared Function PFXIsPFXBlob( _
    ByRef pPfx As CRYPT_DATA_BLOB) As Boolean
    End Function

User-Defined Types:

    [StructLayout(LayoutKind.Sequential)]
    internal struct CRYPT_DATA_BLOB
    {
        public int cbData;
        public IntPtr pbData;
    }

Alternative Managed API:

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Notes:

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Tips & Tricks:

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Sample Code:

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