I can all of a sudden not open attached pdf files to new and old (saved) e-mails, in Outlook Express. The system tells me that the file does not have a program associated with it. It instructs me to create an association in the Folder Options - Control Panel. I tried to but got stuck when I was asked to name the "extension" file. I can save the attachment on Desktop from where it opens without difficulty. But I normally save these e-mails with pdf attached files in appropriate folders on Outlook Express and it is a nuisance not to be able to open them from there.