i had the same issue today.

This is my log file.

0.001 2016-03-05 07:36:17; Factorio 0.12.25 (Build 17747, win64)
0.002 Operating system: Windows 10
0.002 Program arguments: "D:\Program Files (x86)\Steam\steamapps\common\Factorio\bin\x64\Factorio.exe"
0.002 Read data path: D:/Program Files ...