PC MAGAZINE: Chances are good you did not actually create a CON.DOC file. It should be impossible for any program (except a low-level disk utility) to create a file whose filename portion is CON (or any other reserved DOS device name). The standard reserved device names are CON, AUX, PRN, CLOCK$, COM1 through COM4, LPT1 through LPT4, and CONFIG$. In addition, your system will almost certainly have other named devices installed in CONFIG.SYS.
So thats why it crashes windows. Ill keep researching!