How to open Object format .o files
Have you had trouble opening the o file on your computer? What are o files? We explain what they are and recommend software that we know will open them.
What is o file?
Files with o extension are mainly related to the object file format used by various programming languages and development environments.
Object format description
File extension o is traditionally used for Object file format. These files contain object code and any other related data typically produced by a compiler or assembler. Can also be referred to as Object code or Object module.
Many different object file formats are used, because originally, each computer type had its own unique format, but the file extension and purpose of these files was always the same.
Formats that use o file extension include a.out, COFF, ELF, PE, Mach-O, SOM, Hunk, MZ, ECOFF, XCOFF, NE and LX. These are found mainly used in Linux and Unix-like environment, gaming consoles and even some mobile phones.
Shared libraries (so files) are created from object files.
Suggested software to open o file

Microsoft Visual Studio
IDE for creating programs, or websites and web applications
There are other O filename extensions with the same .o suffix
o - UFO: Enemy Unknown game data
Files with o file suffix are associated with the UFO: Enemy Unknown game data format.