Choose Adobe AcrobatĪs you can see, Adobe Acrobat is now the default application for PDF file in this Windows 10 PC. Step 5: To change that, click on Microsoft Edge, and other apps will appear and then choose Adobe Acrobat to be your new default app for PDF files. Currently, my default app for PDF is Microsoft Edge. Scroll down to the bottom of the page, select “Choose default apps by file type. Step 1: Open settings by pressing Win + I or going to the search section and type settings.