In Project Properties under Publishing in Options there is a tab called "File Associations". I have entered there .mpg|MyDesc|MyDescID|myIco.ico. I have hoped that the mpg ext will be automatically associated after I start program. However it did not happen. Even when I choose open with and set the app as default it does not have the icon I have chosen.
How to use it?
I believe I have to create a published version, but I would rather not do it(since I change the app a lot). Is there any way to create the associations without creating an installer?
I believe this has to do with ClickOnce deployment, and is related to file associations when a user decides to install the ClickOnce bundle for your app.
When you say "start" the program - are you referring to F5 or Ctrl+F5? If you "Publish" your ClickOnce bundle and then install from there, I believe your file associations should work.