Word Documents are treated as PDF files when trying to display or download

[dan-omb]

Describe the bug
The system treats all documents as PDF when retrieving them from the database. A .pdf extension is applied to the temporary file which causes the browser to return an error.

To Reproduce
Steps to reproduce the behavior:

1. Upload a word document
2. Click on the link for the new document
3. Note the inline display has an error
4. click on the Download link to see another error

Expected behavior
Since OPAL is intended as a repository and not a tool for working on live attachments. It might make the most sense to limit uploads to PDF or to convert files to PDF on upload.