File Extension O

.O File

File extension: O
File type: File

Notes about the O file extension:

To open this file type, a required software must be installed. Without it you only see a Windows message "The following file cannot be opened" (Windows 7) or "How do you want to open this file?" (Windows 10) if you double-click the file. There click on "More apps" and choose a suitable software to view such files on your PC or from email attachments.

The O file type is primarily associated with 'Executable and Linkable Format'. The Executable and Linking Format (ELF, formerly called Extensible Linking Format) is a common standard file format for executables, object code, shared libraries, and core dumps. First published in the System V Application Binary Interface specification, and later in the Tool Interface Standard, it was quickly accepted among different vendors of Unix systems. In 1999 it was chosen as the standard binary file format for Unix and Unix-like systems on x86 by the 86open project.

Detailed information for file extension O:

Primary association: Executable and Linkable Format
Identifying characters Hex: 7F 45 4C 46 , ASCII: ELF
Related links: Wikipedia ELF Page

Other applications associated with file type O:

  • Free Pascal (Object FIle for Linux or DOS Version) by FPC Development TeamFree Pascal (aka FPK Pascal) is a 32 or 64 bit (from 1.9.6) pascal compiler. It is available for different processors Intel x86, Amd64/x86 64 (from 1.9.6), PowerPC (from 1.9.2), Sparc (from 1.9.6) and Motorola 680x0 (1.0.x only). The following operating systems are supported Linux, FreeBSD, NetBSD, MacOSX/Darwin, MacOS classic, DOS, Win32, OS/2, BeOS, SunOS (Solaris), QNX and Classic Amiga.
  • Object FileTypically lower case on *nix systems.
  • Origin (C Compiled Program File) by OriginLab CorporationOrigin is scientific graphing and data analysis software.
  • UNIX/GCC (Object File)
  • Unknown Apple II File ((found on Golden Orchard Apple II CD Rom))
  • Xcode (Compiled Core C or Assembler Program) by Apple Inc.Xcode is a tool to help to create Mac OS X applications by assisting in the migration of code from other languages.
File Identifier - TrID
'Identifying characters' used on are
provided by Marco Pontello from his TrID database

To change file associations press Windows Key + X and then Apps and Features > Default apps > Choose default apps by file type. Invalid file associations could be the result of underlying issues within your Windows PC.

Technical data

To view technical data on file-extension O click this link to expand/hide the additional area.

System Info for File Extension .O

The following listing is compiled from the database produced by the 'Associate This!' program, selected data from the main FILExt database and information FILExt collected directly from user systems.

ProgramID: Shareaza.Collection
EXEFile: D:\Shareaza\Shareaza.exe %1

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