Files with the .veh extension are used by the Fly! video game. Fly! is made by Terminal Reality. These files store data about vehicles in the game. Veh files are also used by some other games. They hold similar vehicle data for those games.
Sometimes errors happen if there are too many vehicle files. To fix, remove some vehicles so there are fewer files. Then the game can load them all.
You may need to update the game to open newer .veh files. Old versions don’t support the newest formats. Check for updates from the game developer.
Also scan .veh files for viruses first. Use anti-virus software like Norton or Kaspersky. Viruses could be hidden in the files.
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