UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2987.110 Safari/537.36

Example URL:
http://samples.mplayerhq.hu/SWF/test.swf

Steps to reproduce the problem:
1. Open any .swf link in Incognito
2. The file will download instead of playing

What is the expected behavior?
It should open a new tab with the .swf file.

What went wrong?
It downloads the .swf file in Incognito instead of opening it in a new tab.

Does it occur on multiple sites: Yes

Is it a problem with a plugin? No 

Did this work before? Yes 56

Does this work in other browsers? Yes

Chrome version: 57.0.2987.110  Channel: stable
OS Version: 10.0
Flash Version: Shockwave Flash 25.0 r0