The Stackify Prefix tool looks very useful for my .Net applications. So I visit the site and download it. See
http://www.prefix.io/?utm_source=Twitter&utm_medium=PromotedTweet&utm_campaign=PrefixOne
When I try to run it for the first time it askes me how I want to open it and gives my a very odd filename for the suffix. I do not know is my answer. How do you open it?
When you install Prefix it should be running on the following url http://localhost:2012. It will show you the dialog. But to get it start tracing you need to run something of your IIS server
You can then disable the profiler if you need.