diff --git a/lib/hardware_information.rb b/lib/hardware_information.rb
new file mode 100644
index 0000000..d2e332b
--- /dev/null
+++ b/lib/hardware_information.rb
@@ -0,0 +1,6 @@
+module W3DHubLauncher
+  class HardwareInformation
+    def initialize
+    end
+  end
+end
diff --git a/lib/worker/api/legacy_manifest.rb b/lib/worker/api/legacy_manifest.rb
new file mode 100644
index 0000000..672c3e6
--- /dev/null
+++ b/lib/worker/api/legacy_manifest.rb
@@ -0,0 +1,95 @@
+module W3DHubLauncher
+  class Worker
+    class Api
+      class LegacyManifest
+        attr_reader :game, :type, :version, :base_version, :files, :dependencies
+
+        def initialize(file_path)
+          @document = REXML::Document.new(File.read(file_path))
+          root = @document.root
+
+          @game = root["game"]
+          @type = root["type"]
+          @version = root["version"]
+          @base_version = root["baseVersion"]
+
+          @files = []
+          @dependencies = []
+
+          parse_files
+          parse_dependencies
+        end
+
+        def patch?
+          @type == "Patch"
+        end
+
+        def full?
+          @type == "Full"
+        end
+
+        def parse_files
+          @document.root.elements.each("//File") do |element|
+            @files.push(ManifestFile.new(element, @version))
+          end
+        end
+
+        def parse_dependencies
+          @document.root.elements.each("//Dependency") do |element|
+            @dependencies.push(Dependency.new(element))
+          end
+        end
+
+        class ManifestFile
+          attr_reader :name, :checksum, :package, :patch_package, :removed_since, :from, :version
+
+          def initialize(xml, version)
+            @data = xml
+
+            @name = @data["name"]
+            @checksum = @data["checksum"]
+            @package = @data["package"]
+            @removed_since = @data["removedsince"]
+
+            xml.elements.each("Patch") do |patch|
+              @patch = true
+
+              @from = patch["from"]
+
+              if @package.to_s.empty?
+                @package = patch["package"]
+              else
+                @patch_package = patch["package"]
+              end
+            end
+
+            @version = version
+          end
+
+          def removed?
+            @removed_since
+          end
+
+          def patch?
+            @patch
+          end
+
+          def full_and_patch?
+            @package && @patch_package
+          end
+        end
+
+        class Dependency
+          attr_reader :name, :removed_since
+
+          def initialize(xml)
+            @data = xml
+
+            @name = @data["name"]
+            @removed_since = @data["removed_since"]
+          end
+        end
+      end
+    end
+  end
+end
diff --git a/lib/worker/api/legacy_manifest_package.rb b/lib/worker/api/legacy_manifest_package.rb
new file mode 100644
index 0000000..98425bd
--- /dev/null
+++ b/lib/worker/api/legacy_manifest_package.rb
@@ -0,0 +1,67 @@
+require "json"
+require "digest/sha2"
+
+module W3DHubBackend
+  class Worker
+    class Api
+      class LegacyManifestPackage
+        attr_reader :category, :subcategory, :version, :name, :error, :file_size,
+                    :checksum_chunk_size, :sha256_checksum, :checksum_chunks
+
+        def initialize(hash)
+          @category = hash["category"]
+          @subcategory = hash["subcategory"]
+          @version = Gem::Version.new(hash["version"] || "0.0.0.0")
+          @name = hash["name"]
+          @error = hash["error"]
+          @file_size = Integer(hash["size"] || 0)
+          @checksum_chunk_size = Integer(hash["checksum-size"] || 0)
+          @sha256_checksum = hash["checksum"]
+          @checksum_chunks = hash["checksum-chunks"]
+        end
+
+        def error?
+          @error
+        end
+
+        # checksum whole file and file chunks until a mismatch occurs or the whole file is verified.
+        def verify_file(filename)
+          file_size = File.size(filename)
+
+          checksum_chunks = {}
+          overall_checksum = ""
+          overall_digest = Digest::SHA256.new
+          chunk_digest = Digest::SHA256.new
+
+          File.open(filename, "rb") do |f|
+            f.pos = 0
+            offset = 0
+
+            while (chunk = f.read(@checksum_chunk_size))
+
+              overall_digest << chunk
+
+              checksum_chunks[offset] = chunk_digest.update(chunk).hexdigest.upcase
+
+              offset += @checksum_chunk_size
+              chunk_digest.reset
+            end
+          end
+
+          overall_checksum = overall_digest.hexdigest.upcase
+
+          # FIXME: Make this a nice Data struct object
+          [overall_checksum, checksum_chunks, file_size]
+        end
+      end
+    end
+
+    def package_cache_filename(category, subcategory)
+      if subcategory.empty?
+        category
+      else
+        "#{category}-#{subcategory}"
+      end
+    end
+  end
+end