Can't open a png file when hyperlinking through Excel. How to do?
 

I used Excel for an Actions Tracker at work and was hyperlinking Actions to
specific documents. These documents were e-mails which I had saved as png
files using a screen-capture program called SnagIt. The purpose being that
SnagIt would allow me to save an entire e-mail as a single document without
having to cut and paste them into a Word doc.
If I open the png files directly, they will open with Windows Picture & Fax
viewer. However, when hyperlinking through Excel, an error message appears
stating "Cannot open the specified file".
Is there anyway to resolve this?