Loads a certificate from a file.
procedure ImportFromFile(Path: String; Password: String);
This method can load certificates saved in one of the following formats: DER, PEM, PFX, SPC.
Use the Path parameter to provide a path to the certificate, and Password to specify the password. The Password parameter is optional. If it is omitted and it is later discovered that the certificate is password-encrypted, the PasswordNeeded event will be fired to request it.