To fix it, you’ll need to reset the default program for PDF files.
On the PC, right click on any PDF and choose “Open With” from the popup menu.
At the top of the window, you should see the app that’s currently set to open PDFs.
You’ll also see a list of any other app Windows can use to open PDFs, including all your browsers.
Pick the app you want to use to open PDFs from now on and then look at the bottom of the box to see a check box to “Always use this app to open .pdf files.” Click to put a check in that “always open” box and then click OK.
In an instant, you’ll see all the PDF files change over to show the icon of the app you choose. If you chose Acrobat, all the PDF files will now show with an Adobe Acrobat icon.
Mac users can use the same method. Pick a file, right click and choose Get Info.
In the Get Info window, click the arrow to expand the Open With section and you’ll see a popup menu with all your app choices.
Choose the one you want and then click the “Change All” button below and then close the Get Info box.
This advice isn’t just for PDFs. You can set the default app for any file type using these same instructions.
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