Windows
Program file extensions simply identify the type of program. For example, an executable program will have a file extension of .exe, and some music files will have the file extension of .mp3
Files with an extension of .exe are executable files. This type of file is one which is used to open applications games etc. it is the main file for each program. For example to open Internet Explore when you doubel click on the icon it actually make the ie.exe file open up and this gives you the internet explorer window.
PDF files are mainly associated with Adobe Reader, available at http://www.adobe.com
On Windows, applications are run through executable files, which is denoted by the extension .exe
Extension names allow your computer to recognize which program is needed to open the file.
The .npy file extension is opened with the program 'NumPy', a computing and database package for Python.
Files are named in the method: filename.extension When the file is a program, the extension is 'exe' so if a file called 'hello' was a program, it would be called: hello.exe
The .wad extension is normally used for game archives. To open them up, you'll need to figure out what game was using this extension to save its archive and use that game to open up those game archives.
Normally xls is the extension for an Excel spreadsheet document.
The .tmp extension is a TEMPORARY file.Often these files are created during the installation process or during cleanup procedures.Sometimes by changing the extension you can open them in some program or other.If they are old they can safely be removed.
You can overwrite data in the files located in the League of Legends folder, normally located in Program Files/Program Files (x86)
PRZ is a file extension associated with Lotus Freelance Graphics 97 files.