Hi James,
Welcome to Microsoft Answers!
What I understand from your question is that you want to associate file types to use it for work. To do that in Windows 7 follow the below given steps:
1. Click on Start.
2. Select Default Programs.
3. Click on ‘Associate a file type or a protocol with a program’.
4. There you may select the desired extension and click on change program.
5. Browse for the program you are looking for and associate it.
6. Click Ok.
Now check if you accomplish what you had been trying.
For more information visit the below given link.
Change which programs Windows uses by default
http://windows.microsoft.com/en-us/windows7/Change-which-programs-Windows-uses-by-default
Hope this information is helpful.
Amrita M
Microsoft Answers Support Engineer
Visit our Microsoft Answers Feedback Forum and let us know what you think.