In Finder, select
Go menu from menu bar, choose Applications. Then scroll down to WireShare. Right-click or Control-click the WireShare program and choose Get info. Else select WireShare & choose command+i or Get Info from the Finder's File menu.
If you meant you cannot open the attachment in your browser, then that will be due to a browser security setting. For example, set gnutellaforums.com as an allowed site to open new windows & links from.