[MSDN Library June 1998] Windir Environment Variable Lost if Batch File Run from *.PIF (55.2380952380952%)
MSDN Library Visual Studio 6.0 > Knowledge Base > Windows NT
[MSDN Library June 1998] WINDIR Environment Variable Set When Running Windows (24.8156488320423%)
MSDN Library Visual Studio 6.0 > Knowledge Base > Windows 3.x Retail Product