The Microsoft Edge browser is the default app for PDF files on Windows PCs. However, you can easily change your default PDF viewer to Adobe’s Acrobat Reader DC for files saved to your Windows PC.

The new Settings URI is designed to replace default app workflows like this one from Adobe Reader, which opens an old-school Windows 95-style Properties window instead of the Settings app. Credit ...

I'm in Panther, but I don't think Tiger is any different.<BR><BR> (1) "Get Info" (Command - I) on the pdf file.<BR><BR> (2) From "Open With:" option, select Adobe Reader 7.0 from list of ...