status.i4.v = file_exists_c(file_name.i1a.r, options.u4.v)

	This routine will determine whether a file name points to an
	existing file.

	file_name	file name to check
	options		options (not used)

	This function returns status values as follows:

	TRUE			file exists
	FALSE			file does not exist

	This function requires the following include files:

	cbslib_h, acnet_errors_h

	Related functions:

	file_find_in_path_c, file_name_parse_c, file_name_expand_c,
	file_num_lines, file_view_find, file_view_read

	C/C++ usage:

	static const char	file_name[] = "/some_path/file_name.ext";
	int	status;
	unsigned int	options = 0;

	status = file_exists_c(file_name,options);