What are the output file extension? Which files are executable files

types of output files extension.

Output files have any extension that the program outputting them wishes to assign, subject to the need that both the extension and the format of the file must match the input or use of the file in the next step. In other words, if an output file has an extension of .XLS, it is expected it will be taken in by MS Excel and be laid out properly.

Executable files end in .exe