Windows 8 by default offers Reader modern app to open PDF files, whenever you came across a link to a PDF file on page in browser or when you open one such file from your computer it will open in Windows Reader, since Windows 10 Technical Preview was built on top of Windows 8, it is the default handler for PDF files in Windows 10 also.
Disabling Windows 10 PDF Viewer
1. Right click on on any PDF file, select Open with> Choose Default Program
2. In the Popup, click on ‘More options’, select the PDF reader –web-based like Chrome, Firefox or Opera or or desktop one — to make it as default, a notification will appear above the system tray ‘you’ve new apps to open this type of file’.
To make Reader as the default again, right click on any PDF file, select Open with and choose ‘Reader’.
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