![file extension file extension](http://windows10quick.com/wp-content/uploads/2020/05/fileproperties.png)
When finished with step 5, click/tap on Edit (menu bar) and Delete Selected Extensions.
#File extension how to#
This will show you how to have Windows 7 hide or show known file type extensions. Select an extension, press and hold the Shift key, click on another extension to select them and everything inbetween them, then release the Shift key.
![file extension file extension](https://www.journaldev.com/wp-content/uploads/2019/08/file-extension-python.png)
If a match is found, the function returns true. A file name extension is a set of characters added to the end of a file name that identifies the file type or format that determines what default program should open it. The custom validFileType() function takes a File object as a parameter, then uses () to check if any value in the fileTypes matches the file's type property.