The 'How to' in Miguel Melo's post should have work. The goal is to embed a specific html tag using an escaped expression (expression with field ‘Escape Content’ set to ‘No’). When an expression has the ‘Escape Content’ set to ‘No’ the expression is dumped in the html page exactly as the expression.
Another particularly is that you need to including in your application the flash file using Service Studio’s OMLResource utility or using an Extension (via Integration Studio) so you could reference the file as a resource of your application.
By the way, can you tell me why it didn’t work? Was the html wrongly generated?
First you need to ensure that your swf file is being deployed correctly (you can check it in the eSpace deploy directory: c:\program files\outsystems\platform server\running\<espace-name>.<number>, check for the most recent directory <espace-name>.*). If your swf file is not present in the root directory or the 'img' directory you probably configured incorrectly the swf file in the Integration Studio. If this is the case, please guarantee that "Deploy Action" for the file is or 'Copy to Application directory' or 'Copy to Images directory'. After, republish the extension and your espace and re-check that file is present in the deploy directory.
Please let me know if you have any difficulty configuring & deploying the swf file.
Regarding referencing extension resources in the Service Studio, unfortunately it's not possible :(, but you can submit this feature request sending an email to firstname.lastname@example.org.