It is not possible to change a .jpeg to a .txt file but it is possible to display a jpeg, a gif, and an HDR file extension or linux photo extension in a gallery. It is also possible to redirect a file extension to a new location.
See help and support.
How can I control which programs are associated with a file name extension?
Every program that's installed on your computer is designed to open one or more particular file types, each of which is identified by a file name extension. If you have more than one program on your computer capable of opening a file type, then one program is set as the default. To change the program that automatically opens a type of file, see Change the program that opens a type of file.
How do I change a file name extension?
Usually, file name extensions should not be changed because you might not be able to open or edit the file after doing so. Sometimes, however, changing the file name extension can be usefulsuch as when you need to change a text file (.txt) to an HTML file (.htm) so that you can view it in a web browser. To change a file name extension, first ensure that file name extensions are visible. Then, right-click the file you want to change and click Rename. Delete the file name extension, type the new extension, and then press ENTER. Windows will warn you that changing the file name extension might cause the file to stop working properly. If you are certain that the extension you typed is one that the program you are using will understand, click Yes to confirm the change.
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