Use GNU zip if 7-zip is not available, then recompress with advzip.

Deploy/Deploy.csproj

@@ -70,6 +70,7 @@
   </ItemGroup>
   <ItemGroup>
     <Compile Include="Bundle.cs" />
+    <Compile Include="Zip.cs" />
     <Compile Include="Portable.cs" />
     <Compile Include="Package.cs" />
     <Compile Include="Docs.cs" />

Deploy/Program.cs

@@ -71,38 +71,6 @@ static void Metadata()
             File.WriteAllText(path, Version);
         }
 
-        static void Zip(string output, string paths, string working)
-        {
-            if (File.Exists(output))
-                File.Delete(output);
-
-            using (var sz = new Process())
-            {
-                sz.StartInfo = new ProcessStartInfo { FileName = "7za", UseShellExecute = false };
-
-                if (Environment.OSVersion.Platform == PlatformID.Win32NT)
-                {
-                    string exe = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ProgramFiles), "7-Zip\\7z.exe");
-
-                    if (File.Exists(exe))
-                        sz.StartInfo.FileName = exe;
-                }
-
-                sz.StartInfo.WorkingDirectory = working;
-                sz.StartInfo.Arguments = string.Format("a \"{0}\" \"{1}\" -mx=9", output, paths);
-
-                try
-                {
-                    sz.Start();
-                    sz.WaitForExit();
-                }
-                catch (Win32Exception e)
-                {
-                    Console.Error.WriteLine(ExecFailed, sz.StartInfo.FileName, e.Message);
-                }
-            }
-        }
-
         static string Name
         {
             get { return typeof(Program).Namespace.Split(new[] { '.' }, 2)[0]; }

Deploy/Zip.cs

@@ -0,0 +1,104 @@
+using System;
+using System.ComponentModel;
+using System.Diagnostics;
+using System.IO;
+using Microsoft.Win32;
+
+namespace IronAHK.Setup
+{
+    partial class Program
+    {
+        static void Zip(string output, string paths, string working)
+        {
+            if (File.Exists(output))
+                File.Delete(output);
+
+            SevenZip(output, paths, working);
+
+            if (!File.Exists(output))
+                GnuZip(output, paths, working);
+
+            if (File.Exists(output))
+                AdvZip(output);
+        }
+
+        static void AdvZip(string output)
+        {
+            using (var adv = new Process())
+            {
+                adv.StartInfo = new ProcessStartInfo { FileName = "advzip", UseShellExecute = true, Arguments = string.Format("-z -4 \"{0}\"", output) };
+
+                try
+                {
+                    adv.Start();
+                    adv.WaitForExit();
+                }
+                catch (Win32Exception)
+                {
+
+                }
+            }
+        }
+
+        static void GnuZip(string output, string paths, string working)
+        {
+            using (var zip = new Process())
+            {
+                zip.StartInfo = new ProcessStartInfo
+                {
+                    FileName = "zip",
+                    UseShellExecute = true,
+                    Arguments = string.Format("-9 -r -X \"{0}\" \"{1}\"", output, paths),
+                    WorkingDirectory = working
+                };
+
+                try
+                {
+                    zip.Start();
+                    zip.WaitForExit();
+                }
+                catch (Win32Exception e)
+                {
+                    Console.Error.WriteLine(ExecFailed, zip.StartInfo.FileName, e.Message);
+                }
+            }
+        }
+
+        static void SevenZip(string output, string paths, string working)
+        {
+            using (var sz = new Process())
+            {
+                sz.StartInfo = new ProcessStartInfo
+                {
+                    FileName = "7za",
+                    UseShellExecute = true,
+                    Arguments = string.Format("a \"{0}\" \"{1}\" -mx=9", output, paths),
+                    WorkingDirectory = working
+                };
+
+                if (Environment.OSVersion.Platform == PlatformID.Win32NT)
+                {
+                    var install = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ProgramFiles), "7-Zip");
+                    var dir = (string)Registry.CurrentUser.OpenSubKey("SOFTWARE\\7-Zip").GetValue("Path", install);
+                    var exe = Path.Combine(dir, "7z.exe");
+
+                    if (File.Exists(exe))
+                    {
+                        sz.StartInfo.FileName = exe;
+                        sz.StartInfo.UseShellExecute = false;
+                    }
+                }
+
+                try
+                {
+                    sz.Start();
+                    sz.WaitForExit();
+                }
+                catch (Win32Exception e)
+                {
+                    Console.Error.WriteLine(ExecFailed, sz.StartInfo.FileName, e.Message);
+                }
+            }
+        }
+    }
+}