This is a CD-Rom from Valve Software, The 1.6 version of the infamous "WorldCraft" mapping editor for Hexen, Quake, Quake II, and Half-Life, This CD took me some time to locate and I finally found a copy on Archive.org, Older versions such as 1.5 I could not locate fully. This CD-Rom is not by me and I do not take credit for it either.
im first for download
just ico file
Do you own WinRAR? That application can open ISO files like winzip files etc, And remember, This application is only tested under older systems like Windows 2000, Windows XP, and, recently, Tested and works under Windows 8