My phone keeps showing no applications to perform this action. What do I do?

[Winter Storm]

When I try to open files (. pdf or .crdownload) I keep getting no applications to perform this action. What do I do?

 

[B. Diddy]

Welcome to Android Central! Which phone? Do you have Google Drive and Google Docs installed? That ought to open a PDF file. If you copy that file to your PC, does it open there?