The file extension is not necessarily linked to the format of the file but instead just tells File Explorer how to open and read that particular file using the applications you have installed.

You don't need an expensive Adobe subscription to open Illustrator files. Here's are three free or low-cost alternative ways to open AI files.

PowerPoint can’t open this type of file If PowerPoint says that it can’t open or read this type of presentation file, then use these proven fixes to resolve the issue: ...

2] Right-click and go to Properties. 3] Select the Change button under the General tab of the file properties. 4] Choose Notepad or Word in the Open with window.