The other is you may have accidentally changed your computer's default app for opening PDF files yourself.

Need to extract data from PDF files into a spreadsheet so you can analyze it? Find out how seven PDF to Excel conversion tools fared in head-to-head tests with increasingly complex data sources.

Learn how to count pages in multiple PDF files together in Windows 11/10 using a web browser and free PDF page counter tools.

We show you how to disable the PDF security warnings which the Adobe Reader or Acrobat Reader app may throw up when you open a file.