old_contents: from identifier import *
  
  EXE_PATTERNS = [
    '4D 5A 50 00',
    '4D 5A 90 00',
  ]
  
  ELF_PATTERNS = [
      '7F 45 4C 46'
  ]
  
  MSI_PATTERNS = [
      'D0 CF 11 E0'
  ]
  
  class ElfResolver:
      def identify(self, stream):
          return Result('ELF', 'Executable and Linkable Format (Linux binaries)')
      
  class ExeResolver:
      def identify(self, stream):
          return Result('EXE', 'Windows Executable')
  
  class MsiResolver:
      def identify(self, stream):
          return Result('MSI', 'Microsoft Installer')
  
  
  def load(hound):
      hound.add_matches(EXE_PATTERNS, ExeResolver())
      hound.add_matches(ELF_PATTERNS, BinResolver())
      hound.add_matches(MSI_PATTERNS, MsiResolver())
  
new_contents: from identifier import *
  
  EXE_PATTERNS = [
    '4D 5A 50 00',
    '4D 5A 90 00',
  ]
  
  ELF_PATTERNS = [
      '7F 45 4C 46'
  ]
  
  MSI_PATTERNS = [
      'D0 CF 11 E0'
  ]
  
  class ElfResolver:
      def identify(self, stream):
          return Result('ELF', 'Executable and Linkable Format (Linux binaries)')
      
  class ExeResolver:
      def identify(self, stream):
          return Result('EXE', 'Windows Executable')
  
  class MsiResolver:
      def identify(self, stream):
          return Result('MSI', 'Microsoft Installer')
  
  
  def load(hound):
      hound.add_matches(EXE_PATTERNS, ExeResolver())
      hound.add_matches(ELF_PATTERNS, ElfResolver())
      hound.add_matches(MSI_PATTERNS, MsiResolver())
  
subject: Fix typo. XD