.DEX File Extension

Executable file format that contains compiled code written for Android, Google's Linux-based mobile phone platform; technically referred to as a "Dalvik Executable," and can be interpreted by the Dalvik virtual machine.

DEX files can be created manually or by automatically translating compiled Java programs. Multiple DEX files are zipped into a single .APK package, which serves as the final Android application file.

X-ray image saved in the proprietary X-ray format; used by the DEXIS Digital X-ray system for dental imaging; captures dental radiographs and saves them in a digital format.

DEXIS was acquired by Danaher Corporation in 2005.

Spreadsheet or group of spreadsheets created by MS Excel; contains data formatted in cells, which are organized into rows and columns.

The .XLS extension is much more commonly used for Excel files.