You've found an interesting game or an application on the Internet, download and install it on your computer, but it appears when you start with a warning dialog box that you must have a special library file, which is responsible for the operation of the system.
Remember the names of the files, go to the web and, by following links should wlanapi dll download and store on your computer. After that, you must find the system files that are located in a specific folder, copy the resulting file, and if you are asked to replace the old one.
How to download free wlanapi.dll?
Then restart the computer for normal application to all the commands prescribed in the library file, remembered and applied.