C:\Users\Matty\AppData\Local\Temp\WERFB4F.tmp.WERInternalMetadata.xml
C:\Users\Matty\AppData\Local\Temp\WER1564.tmp.appcompat.txt
C:\Users\Matty\AppData\Local\Temp\WER197B.tmp.mdmp

These are the only things I could find but I must admit I am not sure if I have found the correct crash dump reports. Hopefully they are and they can help.

Faulting application name: arma3.exe, version: 1.30.127.372, time stamp: 0x54255879
Faulting module name: aticfx32.dll, version: 8.17.10.1124, time stamp: 0x4f816b30
Exception code: 0xc0000005
Fault offset: 0x0007808a
Faulting process id: 0x1570
Faulting application start time: 0x01cfe47a7865974d
Faulting application path: C:\Program Files (x86)\Steam\steamapps\common\Arma 3\arma3.exe
Faulting module path: C:\windows\system32\aticfx32.dll
Report Id: c039ce41-506e-11e4-9134-e840f2a5dac4

I done a bit more digging and came up with this. Does it help?