.JPG_320X320 File

The jpg_320x320 file extension is found on picture files saved in some Android based smartphones, like Samsung Galaxy S.

These jpg_320x320 files are stored in "my files" folder and look to be encrypted. They are perhaps generated by some app.

How to open:

If your file is not encrypted, it may be viewable using any graphics editor with JPEG support.

How to convert:

Considering this file is just a JPEG image in a fixed size, you can convert it to other graphics much like any common .jpg file. You may need to rename the extension to regular jpg first though.