.C is an uncommon file format. Below are some definitions for it.
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Operating system: Any (MS-DOS, DR-DOS, Windows, Windows 9x, Windows NT, Linux, GNU/Linux, Classic MacOS, MacOS, MacOS X, OS X, iOS, Android, ChromiumOS, ChromeOS, OS/2, Solaris, FreeBSD, NetBSD, OpenBSD, DragonflyBSD, etc.)
To execute the file, you will need a C interpreter.
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A C file is a source code file for the C++ programming language. In the early days of C++ development, the C file extension was used. This was problematic on systems that didn't know how to differentiate uppercase from lowercase, and it caused general confusion with the c file extension used in the C programming language. Nowadays, C++ uses either the cc, cpp, cxx, or (no other entries to show) file extension.
A pseudo-extension is a file format that is applied to a file, despite not having a purpose, other than to change the file name (such as AB.C or GRADE=.C) however this file extension is rarely used as a pseudo-extension
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Opens with: Gedit, Notepad++ (GNU/Linux) Notepad, Notepad++ (Windows) ???, Notepad++ (MacOS) ???, Notepad++ (BSD) HTML Viewer (Android) ??? (iOS/iPadOS/iPhoneOS) ??? (OS/2) ??? (MS-DOS) ??? (DR-DOS) ??? (Solaris) etc.
Shebang? Typically none, none required
Encoding: Any (commonly ASCII)
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GNOME 1: 
GNOME 2: 
GNOME 3: 
GNOME 40: 
GNOME 41: 
KDE 1: 
KDE 2: 
KDE 3: 
KDE 4: 
KDE 5: 
XFCE: 
LXQT: 
CINNAMON: 
Common Desktop Environment (CDE): 
MacOS (Classic): 
MacOS (Mac OS X): 
MacOS (OS X): 
MacOS (MacOS 10.10-10.12): 
MacOS (Modern, pre-MacOS11): 
MacOS (Modern, MacOS11): 
WinRAR: 
Android: 
iOS: 
Windows (DOS): 
Windows (9x): 
Windows (NT): 
Solaris: 