The file extention of any application on a computer is: '.exe'
.exe = simply means executable.
microsoftword
not all file names have two parts. MacOS - MacOS9 the filenames were one solid line - macintosh_video_file. The application data was hidden in the resource fork. On Unixes and DOS boxes a file name consists of file name and extension.
The default file extension for notepad is .txt. However, you can designate notepad as the primary application for any extension.
Database Management Systems, or DBMS, are software applications specially designed to interact with the user and other applications, as well as the database itself, to analyze data. All files in a software have file name extensions to identify their file types. For memory files .mem is the file name extension.
A file name is what a file is called. A file extension defines what type of file it is. (Text file, HTML file, executable, etc.)
The main project file has a VBPROJ extension. This is also a file with the same name as the main project file, but with an SLN extension. The SLN extension is a solution file.
. (Dot)
It is a batch command file.
Close the process. Then, re-open it as an application with a batch file: Start "program name" [no extension] /high "Location of Program".
It doesn't use any part of the file. It gets the extension (the part after the dot) of the file name, and looks that up in the registry to see what program should be used to open, for example, a .doc file.
File extension.
Folders have no extension.
For most typical Word documents the extension is .docFor Excel workbooks (spreadsheets) the extension is .xlsIn general the file extension is the 3 letter/number "code" after the period in the complete file name that gives a hint as to what type of file it is. For example, in the file name resume.docthe word resume is the file's actual name and the .doc tells you that it is a document file.