filename

IN:

Complete path and filename of the file to be checked

	Purpose	Determines if a file is an HDF file.
	Return value	Returns TRUE (or 1) if the file is an HDF file and FALSE (or 0) otherwise.
	Description	The first four bytes of a file identify it as an HDF file. It is possible that Hishdf will identify a file as an HDF file but Hopen will be unable to open the file; for example, if the data descriptor list is corrupt.