The file v3dr0412.nls is a V3 Common file from the V3 security software suite from AhnLab, Inc.  An nls file is a National Language Services driver that sets up the character map and fonts for the supported language.  Some programs will not run without the nls files installed.  V3 is an internet security system created by the Korean company AhnLab, and referred to also as a vaccine system.  Files are shared among the various V3 programs, so this file may be required for any program in this suite.  If you get an error with this file, you should clean your registry to try to fix the error.

The registry is a database at the heart of Windows that tracks every file you have installed on your computer.  A mistake in the registry means that Windows cannot find the file when it needs it to run a program.  ZookaWare PC Cleaner cleans mistakes in your registry, finding and fixing every error to get your system back to full speed.