CoD WaW Impure Client - Invalid.iwd files - ERROR

Call of Duty: World at War - Impure Client - Invalid.iwd files - Error screen

The use of custom maps and modifications can still lead to above picture.

In the last few days it became clear that the current WaW set-up for placing custom made files on servers and on players PC's can produce unwanted errors. Concerned server-administrators already spoken to JD_2020 about this. Also the amount of unnecessary double downloads for players and 1024 characters limit for amount of maps in rotation has been a point of discussion with JD_2020. We'll keep you informed when there is any news.

But what to do if you get this kind of error-screen ?

1. Try another server.

2. Delete the mods folder.

XP example where to find this mods folder :