it finds the extension in its list and uses the program associated with that file type. For example, if you ask Windows to open a text file (.TXT), Windows will use Notepad to open that file.

understanding the extensive list of file extensions is not as simple as it seems. In addition, it's not uncommon to find incompatibilities between versions and file types when, for example ...

and that includes file extensions. Another reason to copy the file names would be if you would like to use the file names in a batch process. For example, you could use the file names to rename ...

Microsoft plans to expand the list of file extensions that are banned in Outlook for the web (previously known as Outlook Web Access (OWA)). The list, which previously included 104 file extensions ...