Sharepoint can set the Document Handling to be a little restrictive, requiring the user to download the doc first. This can present a 'User Experience' problem.
Luckily, the solution is over at pdfshareforms.com?
"The solution is to change Browser File Handling property on Web Application level. For that you need to be a Farm Administrator. Steps to change Browser File Handling property:
- Go to SharePoint 2010 Central Administration > Application Management > Manage Web Applications
- Select the row of your web application
- Click General Settings in the ribbon
- Scroll down to Browser File Handling and select Permissive
- Click Ok