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O File - What is an .o file and how do I open it?

Learn about .O files and view a list of programs that open them.

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Overview

What is an O file? An O file is a compiled C program object. Some C compilers create O files during the executable ( .EXE ) creation process. O files themselves are typically not executable.

More Information When compiling a C program, compilers first transform all the program's source code files into compiled object files. These compiled files typically use the .o or .OBJ extension. The compiler then links the compiled object files into an executable file. Some examples of compilers that produce O files include GNU Compiler Collection (GCC)'s C and C++ compilers and Tiny C Compiler.

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.O File Extension

Compiled C Object File

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What is an O file?

An O file is a compiled C program object. Some C compilers create O files during the executable ( .EXE ) creation process. O files themselves are typically not executable.

More Information

When compiling a C program, compilers first transform all the program's source code files into compiled object files. These compiled files typically use the .o or .OBJ extension. The compiler then links the compiled object files into an executable file.

Some examples of compilers that produce O files include GNU Compiler Collection (GCC)'s C and C++ compilers and Tiny C Compiler.

How to open an O file

C and C++ compilers, such as GCC and Tiny C Compiler, often create, reference, and use O files during the program compilation process. For example, you can use Tiny C Compiler's -o command to link O files together and create an executable.

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Programs that open or reference O files

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Windows

GNU Compiler Collection (GCC)

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Tiny C Compiler

Free

Mac

GNU Compiler Collection (GCC)

Free

Tiny C Compiler

Free

Linux

GNU Compiler Collection (GCC)

Free

Tiny C Compiler

Free

Category: Developer Files

Updated: May 2, 2022

FAQ

What is an O file?↓
An O file is a compiled C program object. Some C compilers create O files during the executable (.EXE) creation process. O files themselves are typically not executable.
How do I open an .o file?↓
C and C++ compilers, such as GCC and Tiny C Compiler, often create, reference, and use O files during the program compilation process. For example, you can use Tiny C Compiler's -o command to link O files together and create an executable.

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