status.i4.v = bpm_protect_file_c(file_number.i4.v, protection.i4.v)

	This routine changes the protection for a BPM file for the selected
	machine.  See bpm_machine_c.

	file_number	number of file to change protection for (starts at 1)
	protection	file protection code
			(BPM_NO_PROTECT -> unprotect file,
			 BPM_USER_PROTECT -> standard user protection)

	This function returns ACNET status values as follows:

	OK			success
	CBS_INVARG		invalid file number passed
	SQL_xxx			database error

	This function requires the following include files:

	ul_cbsaux/bpmuti.h, acnet_errors_h

	Related functions:

	bpm_machine_c, bpm_get_save_file, bpm_get_default_save_file,
	bpm_set_save_file, bpm_save_data, bpm_rename_file_c,
	bpm_set_reference_file_c, bpm_link_file_c, bpm_unlink_file_c,
	bpm_next_unlinked_file_c, bpm_file_link_info_c,
	bpm_find_oldest_file_number_c, bpm_file_menu_c, bpm_directory_info

	C/C++ usage:

	int	status;
	int	file_number = 1;
	int	protection = BPM_NO_PROTECT;

	status = bpm_protect_file_c(file_number,protection);