Due to popular demand, our developers have taken on the feedback from our forum users and the latest version of the CCleaner Browser preview (which started to go live into distribution on Friday evening) no longer picks up PDF file associations unless there is no other application on your PC defined to handle them.
As most people view PDFs in a web browser rather than a specialised application, it is standard behaviour for any web browser to pick up PDF file associations upon installation - much to the annoyance of Adobe Acrobat users who want to be able to open files from their Windows desktop directly into an editor. Our commitment is to build a "better browser" - with native ad blocking and better privacy, better battery life, less CPU usage and faster browsing than other web browsers ... and fewer annoyances. Thanks everyone for your patience and feedback to help us get this taken care of. We're looking forward to being able to take the CCleaner Browser live to full launch in the next few weeks, with more performance and privacy features to come.