This is version DEM-alpha-d1-v1.0 [build 2005] of Half-Life: Zombies Ate My Neighbours.
How to use
You can use software such as PowerISO to mount the ISO to a virtual drive. Or, you can extract the ISO to anywhere of your liking.
Notice: Petr's name is spelled wrong, it's Vyhlidal, not Vhlyidal.