[Testing pathfinder update]

18 hours ago, stanislas69 said:

It should else the game wouldn't run anyway. So either your antivirus removed it or you placed the pyrogenesis file in the wrong folder.

Perhaps I am misunderstanding you.  I have replaced the existing pyrogenesis.exe file that I know the installed Start Menu shortcut to start the game is pointing to (in my case: C:\Users\USER\AppData\Local\0 A.D. alpha\binaries\system\Pyrogenesis.exe) with the one in the system.zip in this thread.  It seems to me that the problem is that the release pyrogenesis.exe has been linked to mozjs38-ps-release-vc120.dll that has been installed by the installer into the above directory, while the test pyrogenesis.exe has apparently been linked to (according to the error message) mozjs38-ps-release-vc140.dll which is probably somewhere in the path of your develepment machine but is not part of a normal install.

A bit of googling leads me to believe the xxx_vc120.dll was compiled by Visual Studio 2013 while xxx_vc140.dll was compiled by Visual Studio 2015.

Anyway not sure if this multithreading work is still going on, was just curious to give it a try.

[Testing pathfinder update]

Was trying this out on Windows 10 1809 64bit.  I get this error:

The installation directory contains mozjs38-ps-release-vc120.dll.  Maybe your guys build environment has this on path but the latest (.23alpha Mk2) does not.