Game crashes to desktop in Windows 10 Boot Camp MacBook Air 2015 11" (Intel HD 6000)
Just a little bit of research on Far Cry 2 we get the following:

System Requirements:


2GB RAM
256MB VRAM
Windows XP 32bit


Your MacBook Air came with either 4 or 8GB of RAM.  Regardless, if you are running Boot Camp with a 32bit version of Windows (XP, Vista, 7, 8, 10, whatever), the most RAM you are going to be able to access is 3.5GB

Integrated Graphics:
Intel HD 6000 uses up to 1.5GB of shared memory.  From Apple's website:


  Apple computers using newer versions of Intel HD Graphics as the
  primary GPU dynamically allocate up to 1.5 GB of system memory.


So, you are at a max of 2GB RAM.  Win10 requires a minimum of 1GB of RAM with 2GB recommended.  You're at the very edge of what the system calls for.  Additionally, it specifies Windows XP 32bit.  If you are running a 64bit OS, there's no telling how this will function, if at all and there's no compatibility statement that I could find with respect to Windows 10.

However, from a discussion forum there's this little quote (re:  FC2 on MBA w/ HD3000):


  I can say with 100% certianty that a vid card like yours being intel
  onboard junk will NOT run the game in any way. Infact i suggest
  against buying anything made in the last 5 years and trying to play.


and


  I highly doubt that. The only way to be sure is to try, but I think
  you'd be wasting time and money.


So, you may get it to work in Boot Camp under Windows XP 32bit but because of the architecture of the MBA, it may not be worth the effort.