Hello @binarycocoa, please copy your system information from steam (Steam -> Help -> System Information) and put it in a gist, then include a link to the gist in this issue report.
Here is the info, let mek now if you need anything else.
https://gist.github.com/binarycocoa/8136601c67e54d720f43bd9c51d540c0
It works for me too.
https://gist.github.com/cobblestone/f1e00a8bc66f8ca73fd8debd72d447e7
Found in the 2018-10-05 white list update.
Nothing extracted yet.
Fieldrunners 2 runs perfectly and can probably be whitelisted. I was able to launch, start a new game, play some levels, and it all seemed to work perfectly well.
https://gist.github.com/binarycocoa/8136601c67e54d720f43bd9c51d540c0