Answer:
the threat of exposing your computer to a virus
Step-by-step explanation:
Remember, a pop-up message is one of several strategies used by bad actors to get internet users into downloading malicious programs into their computers.
Consider,
- the said "custom codec" is being downloaded not from the official windows app store; a red flag.
- a typical web browser is able to play most of the various video formats available online.
- even if this program works as intended; it may gain maliciously gain access to your system data.