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

File Extension

O File Format

Object file (Unix)

O is a file extension for an object file used with Unix and Linux systems. O stands for object. O files contain C or C++ source code to be compiled into an application. O files can be opened by GCC (GNU C and C++ Compiler) on Unix and Linux systems, and Microsoft Visual Studio on Windows systems.

The O file extension is also used for Atari object files and GCC object files

MIME type: application/x-object-file; application/x-object

 

Learn more about .O files:

See our C, C++ and C# Cheat Sheets.

Visit the C++ web page.

Read the C FAQ at ITKnowledgeExchange.com.

This was last updated in August 2010
Editorial Director Margaret Rouse

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