Many ppl get the error about Couldn't open de_aztec.wad. I am going to show you how to fix it. The error tells you that de_aztec.wad is missing from cstrike folder and you should download it.
Step 1: Get http://www.cstrike-planet.com/wads/126-de_aztec the de_aztec.wad
Step 2: Move de_aztec.wad into your Cstrike folder (ex: c:\steam\steamapps\username\counter-strike\cstrike)
Step 3: No more Couldn't open de_aztec.wad error
Have fun :), If you have any questions you can leave a comment below
FIX Warning:Couldn't open de_aztec.wad
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