What is .NEX file?
Zip file created as an open format for browser add-on development; packaging format that holds all the files and folders for an extension; used to install browser add-ons, like adblockers; supports a large amount of the Google Chrome web browser (Chromium) extensions.
If you have created the .OEX file format for Opera 11 and 12 web browsers you should convert them to the Chromium-based Opera 15 browser format, which is NEX and .CRX.
NOTE: Opera runs Chromium's CRX files as long as the extension uses the chrome specific APIs that Opera supports.
Recommended Software Programs to open .NEX file