docs: def isSupportedContent(cls, fileContent):
          """Returns if the files are valid for this filetype"""
          magic = bytearray(fileContent)[:4]
          return magic == p('>I', 0xfeedface) or magic == p('>I', 0xfeedfacf) or magic == p('<I', 0xfeedface) or magic == p('<I', 0xfeedfacf)