What is ADD? What Opens a ADD? File Format List from WhatIs.com

File Extension

ADD File Format

OS/2 adapter driver file used in the boot process

ADD is a file extension for an OS/2 adaptor driver file format used by the OS/2 boot process. OS/2 is an IBM operating system, introduced in 1987, that was intended to provide an alternative to Microsoft Windows for both enterprise and PC users. 


Learn more about ADD files:

See Barbara Darrow’s article ‘Is IBM considering an OS/2 redo?’ at SearchDataCenter.com.

Search for answers to ADD-related questions at IT Knowledge Exchange.

This was last updated in July 2010
Editorial Director Margaret Rouse

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