Add support for self-extracting .exe archives.

Library/Homebrew/cask/lib/hbc/container.rb

@@ -6,6 +6,7 @@ require "hbc/container/bzip2"
 require "hbc/container/cab"
 require "hbc/container/criteria"
 require "hbc/container/dmg"
+require "hbc/container/self_extracting_executable"
 require "hbc/container/executable"
 require "hbc/container/generic_unar"
 require "hbc/container/gpg"
@@ -32,6 +33,7 @@ module Hbc
         Ttf,
         Otf,
         Air,
+        SelfExtractingExecutable,
         Cab,
         Dmg,
         SevenZip,

Library/Homebrew/cask/lib/hbc/container/self_extracting_executable.rb

@@ -0,0 +1,15 @@
+require "hbc/container/generic_unar"
+
+module Hbc
+  class Container
+    class SelfExtractingExecutable < GenericUnar
+      def self.can_extract?(path:, magic_number:)
+        return false unless magic_number.match?(/\AMZ/n)
+
+        SystemCommand.run("file",
+                          args: [path],
+                          print_stderr: false).stdout.include?("self-extracting")
+      end
+    end
+  end
+end