No problem -
- In PowerPoint (I'm using 2010), create your hot spot image or import a picture as your hot spot.
- Select your image (give it focus in PowerPoint).
- Click on Insert (tab).

- Click on Action; the Action Settings popup opens.
- In Action on click, select Hyperlink to:
- Click the dropdown list, scroll to the bottom and select Other File...; the Hyperlink to Other File popup opens.

- Navigate to and select your "other file" (your Word.doc file).

- Click OK.
Now run your PP project (
Slide Show tab >
From Beginning) and click on your hotspot - Word will open your document with focus ("in front").
Regards,
GEWB