title says it all ...
I have to run my project in a .shtml page, so I changed the run/debug settings > URL or path tho launch to the correct index.shtml page. But now instead of opening it in the browser, FlashPlayer.exe is opened ...
Where can I change settings for this?
If you have a local server running, point to the localhost URL and the browser should launch.
If you're using file:/// and pointing to a non html/htm page, this will crop up. The rationale here is that extensions like shtml only make sense when running on http://
I am wondering whether the FlashBuilder preferences should be modified to allow URLs open in the external browsers.
Make sure External Browser is selected for openings URLs. This can be done by Window -> Preferences -> General -> Web browser. Then, select 'Use External Browser'.