Adobe version 5 was different apparently. There you had PDFWriter and if you created a registry key called "PDFFilename" in the [HKEY_CURRENT_USER\Software\Adobe\Acrobat PDFWriter] you could suppress the "Save As" dialog box. With PDFFilename you could put an * at the end of the string "C:\myfax.pdf*" to persist the setting (user never prompted to input a file name).