pdfFileName, from disk, applying the specified password, and constructs a PDF handle as
*pdfPtr. This function must be called before any of the functions that access a PDF file.
pdfLoadFileWithPasswordW is identical to
pdfLoadFileWithPassword, except that the file name is Unicode
wchar_t* instead of
pdfLoadFileWithPassword function returns
pdfOk if successful, otherwise an
This function is only available on Windows.
IMPORTANT: The PDF file on disk must not be deleted or modified
pdfFree is called.