DEX

A .DEX file is a multi-file that has 4 different options.

Dalvik Executable File
A .DEX (Dalvik Executable File) is an executable file saved in a format that contains code for Android. Technically, it is referred to a Dalvik Executable. Several of these files can be found in APK files, which serves as the final Android application file.

Excel Spreadsheet
Spreadsheet or several spreadsheets containing cells, columns, rows, and more. This hace since been replaced with XLS, but this file is rarely used.

Disketch Project File
Disc label project created by Disketch label design software. It saves a layout for a CD or DVD and can have text and images. This has since been replaced with DEPROJ. Even though this file is no longer used, it can still be opened with current versions of Disketch.

DEXIS Digital X-ray File
A saved X-ray image from DEXIS' X-ray software for dental imaging. Captrues dental raidographs and saves them in a digital format.