This section describes how to view password-protected files by using the Viewing API.
To view password-protected files
Set the password with the VAPIMWP_INIT_SETPASSWORD message parameter.
For password-protected PST files, this message must be called before the VAPIMWP_INIT_OPEN_DOCUMENT
message.
For password-protected Microsoft Office 2007 and 2010 files, this message must be called before the VAPIMWP_INIT_OPEN_DOCUMENT
message.
For password-protected ZIP files, this message can be called after the VAPIMWP_INIT_OPEN_DOCUMENT
, but must be called before the protected subfile is extracted or viewed.