Adobe Acrobat Reader is behaving like malware. I choose to use another PDF reader as my default for opening PDFs, every now and then the Adobe Acrobat Reader updates itself (also without my permission, or any option for control I can find), it takes the liberty to change my default settings for PDF files. This is not OK!

It even changes my Windows PC's default PDF reader if I make an certain changes to the Adobe Reader Preferences.

Is uninstalling Adobe Reader the only way I can fix this?