O file extension

You can open file with O using special software abopted to do this. In order to open O file download one of the software.

How to open O file

O Icon
File type:
Compiled Object File
Developer files

C compiler object file that is usually generated instead of an application file during the development process.

How to open file with O extension?

GNU project C and C++ compiler (GCC)
GNU project C and C++ compiler (GCC)

Similar file formats and extensions.