1. Open Windows Explorer (not Internet Explorer)
2. Go to the Tools menu and choose Folder Options
3. Click on the File Types tab.
4. Scroll down until you find the file extension that is opening with
the wrong application, in this example, look for PDF, and select it
with a single click.
5. Below this, where it says Opens With, it tells the default application
for opening this program. In this example, if it shows Microsoft Word,
click on the Change button.
6. It will then tell you to "Click the program you want to use
to open '.PDF'." Find Adobe Acrobat, or it might be called Portable
Document Format.
7. Click OK and Close and the changes should be made.
When I double-click
on a .pdf document, it opens in Microsoft Word. How do I change the default
application for opening a particular file type?