What is .C#= file extension?
Source code for a C or C++ program; may include an entire program's source code, or may be one of may source files referenced within a programming project; can be edited using a basic text editor, but will not show syntax highlighting like most software development programs do.
C++ is the programming language used for creating many of today's software programs. Some Unix compilers use a lowercase ".c" extension for C and an upper case ".C" extension for C++, although this convention is not common.
Common C Filenames:
main.c - A source code file typically containing the main() function, or entry point, for a C program.
You can see a list of software programs here on easyfileopener.org that can open this file type so that you don’t need to search for it on the web. You can then open your file with this extension using a software listed below.