If you need to extract Flash ActionScripts (.as) from Flash videos (.swt) you need to use either Adobe Flash or if possible some Flash decompression utilities. Consulting various forums about Flash may be a good options as they usually contain plenty of useful information and tips from other users.
Convert Adobe (Shockwave) Flash template to Adobe Flash ActionScript document.
We found 2 software records in the database related to .swt to .as file format conversion.
Microsoft Windows software - convert swt to as on Windows
Multimedia platform used to add animation, video, and interactivity to web pages
Convert from swt file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned swt to as. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Apple macOS / Mac OS X software - convert swt to as on OS X
Mac version of Flash development platform from Adobe