diff --git a/src/Tgstation.Server.Host/Components/Engine/ByondInstallation.cs b/src/Tgstation.Server.Host/Components/Engine/ByondInstallation.cs
index 780fc91a5a..345ee5e743 100644
--- a/src/Tgstation.Server.Host/Components/Engine/ByondInstallation.cs
+++ b/src/Tgstation.Server.Host/Components/Engine/ByondInstallation.cs
@@ -1,9 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Globalization;
-using System.Linq;
 using System.Threading.Tasks;
-using System.Web;
 
 using Tgstation.Server.Api.Models;
 using Tgstation.Server.Api.Models.Internal;
@@ -14,25 +12,25 @@ namespace Tgstation.Server.Host.Components.Engine
 	/// <summary>
 	/// Implementation of <see cref="IEngineInstallation"/> for <see cref="EngineType.Byond"/>.
 	/// </summary>
-	sealed class ByondInstallation : IEngineInstallation
+	sealed class ByondInstallation : EngineInstallationBase
 	{
 		/// <inheritdoc />
-		public EngineVersion Version { get; }
+		public override EngineVersion Version { get; }
 
 		/// <inheritdoc />
-		public string ServerExePath { get; }
+		public override string ServerExePath { get; }
 
 		/// <inheritdoc />
-		public string CompilerExePath { get; }
+		public override string CompilerExePath { get; }
 
 		/// <inheritdoc />
-		public bool PromptsForNetworkAccess { get; }
+		public override bool PromptsForNetworkAccess { get; }
 
 		/// <inheritdoc />
-		public bool HasStandardOutput { get; }
+		public override bool HasStandardOutput { get; }
 
 		/// <inheritdoc />
-		public Task InstallationTask { get; }
+		public override Task InstallationTask { get; }
 
 		/// <summary>
 		/// If map threads are supported by the <see cref="Version"/>.
@@ -103,7 +101,7 @@ namespace Tgstation.Server.Host.Components.Engine
 		}
 
 		/// <inheritdoc />
-		public string FormatServerArguments(
+		public override string FormatServerArguments(
 			IDmbProvider dmbProvider,
 			IReadOnlyDictionary<string, string> parameters,
 			DreamDaemonLaunchParameters launchParameters,
@@ -113,10 +111,7 @@ namespace Tgstation.Server.Host.Components.Engine
 			ArgumentNullException.ThrowIfNull(parameters);
 			ArgumentNullException.ThrowIfNull(launchParameters);
 
-			var parametersString = String.Join('&', parameters.Select(kvp => $"{HttpUtility.UrlEncode(kvp.Key)}={HttpUtility.UrlEncode(kvp.Value)}"));
-
-			if (!String.IsNullOrEmpty(launchParameters.AdditionalParameters))
-				parametersString = $"{parametersString}&{launchParameters.AdditionalParameters}";
+			var parametersString = EncodeParameters(parameters, launchParameters);
 
 			var arguments = String.Format(
 				CultureInfo.InvariantCulture,
@@ -142,7 +137,7 @@ namespace Tgstation.Server.Host.Components.Engine
 		}
 
 		/// <inheritdoc />
-		public string FormatCompilerArguments(string dmePath)
+		public override string FormatCompilerArguments(string dmePath)
 			=> $"-clean \"{dmePath ?? throw new ArgumentNullException(nameof(dmePath))}\"";
 	}
 }
diff --git a/src/Tgstation.Server.Host/Components/Engine/EngineInstallationBase.cs b/src/Tgstation.Server.Host/Components/Engine/EngineInstallationBase.cs
new file mode 100644
index 0000000000..8bd53be358
--- /dev/null
+++ b/src/Tgstation.Server.Host/Components/Engine/EngineInstallationBase.cs
@@ -0,0 +1,57 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Web;
+
+using Tgstation.Server.Api.Models.Internal;
+using Tgstation.Server.Host.Components.Deployment;
+
+namespace Tgstation.Server.Host.Components.Engine
+{
+	/// <inheritdoc />
+	abstract class EngineInstallationBase : IEngineInstallation
+	{
+		/// <inheritdoc />
+		public abstract EngineVersion Version { get; }
+
+		/// <inheritdoc />
+		public abstract string ServerExePath { get; }
+
+		/// <inheritdoc />
+		public abstract string CompilerExePath { get; }
+
+		/// <inheritdoc />
+		public abstract bool HasStandardOutput { get; }
+
+		/// <inheritdoc />
+		public abstract bool PromptsForNetworkAccess { get; }
+
+		/// <inheritdoc />
+		public abstract Task InstallationTask { get; }
+
+		/// <summary>
+		/// Encode given parameters for passing as world.params on the command line.
+		/// </summary>
+		/// <param name="parameters"><see cref="IReadOnlyDictionary{TKey, TValue}"/> of parameters to encode.</param>
+		/// <param name="launchParameters">The active <see cref="DreamDaemonLaunchParameters"/>.</param>
+		/// <returns>The formatted parameters <see cref="string"/>.</returns>
+		protected static string EncodeParameters(
+			IReadOnlyDictionary<string, string> parameters,
+			DreamDaemonLaunchParameters launchParameters)
+		{
+			var parametersString = String.Join('&', parameters.Select(kvp => $"{HttpUtility.UrlEncode(kvp.Key)}={HttpUtility.UrlEncode(kvp.Value)}"));
+
+			if (!String.IsNullOrEmpty(launchParameters.AdditionalParameters))
+				parametersString = $"{parametersString}&{launchParameters.AdditionalParameters}";
+
+			return parametersString;
+		}
+
+		/// <inheritdoc />
+		public abstract string FormatCompilerArguments(string dmePath);
+
+		/// <inheritdoc />
+		public abstract string FormatServerArguments(IDmbProvider dmbProvider, IReadOnlyDictionary<string, string> parameters, DreamDaemonLaunchParameters launchParameters, string logFilePath);
+	}
+}
diff --git a/src/Tgstation.Server.Host/Components/Engine/OpenDreamInstallation.cs b/src/Tgstation.Server.Host/Components/Engine/OpenDreamInstallation.cs
index 66a2e11b9d..e6413570f1 100644
--- a/src/Tgstation.Server.Host/Components/Engine/OpenDreamInstallation.cs
+++ b/src/Tgstation.Server.Host/Components/Engine/OpenDreamInstallation.cs
@@ -1,8 +1,6 @@
 using System;
 using System.Collections.Generic;
-using System.Linq;
 using System.Threading.Tasks;
-using System.Web;
 
 using Tgstation.Server.Api.Models;
 using Tgstation.Server.Api.Models.Internal;
@@ -13,25 +11,25 @@ namespace Tgstation.Server.Host.Components.Engine
 	/// <summary>
 	/// Implementation of <see cref="IEngineInstallation"/> for <see cref="EngineType.OpenDream"/>.
 	/// </summary>
-	sealed class OpenDreamInstallation : IEngineInstallation
+	sealed class OpenDreamInstallation : EngineInstallationBase
 	{
 		/// <inheritdoc />
-		public EngineVersion Version { get; }
+		public override EngineVersion Version { get; }
 
 		/// <inheritdoc />
-		public string ServerExePath { get; }
+		public override string ServerExePath { get; }
 
 		/// <inheritdoc />
-		public string CompilerExePath { get; }
+		public override string CompilerExePath { get; }
 
 		/// <inheritdoc />
-		public bool PromptsForNetworkAccess => false;
+		public override bool PromptsForNetworkAccess => false;
 
 		/// <inheritdoc />
-		public bool HasStandardOutput => true;
+		public override bool HasStandardOutput => true;
 
 		/// <inheritdoc />
-		public Task InstallationTask { get; }
+		public override Task InstallationTask { get; }
 
 		/// <summary>
 		/// Initializes a new instance of the <see cref="OpenDreamInstallation"/> class.
@@ -56,39 +54,27 @@ namespace Tgstation.Server.Host.Components.Engine
 		}
 
 		/// <inheritdoc />
-		public string FormatServerArguments(IDmbProvider dmbProvider, IReadOnlyDictionary<string, string> parameters, DreamDaemonLaunchParameters launchParameters, string logFilePath)
+		public override string FormatServerArguments(
+			IDmbProvider dmbProvider,
+			IReadOnlyDictionary<string, string> parameters,
+			DreamDaemonLaunchParameters launchParameters,
+			string logFilePath)
 		{
 			ArgumentNullException.ThrowIfNull(dmbProvider);
 			ArgumentNullException.ThrowIfNull(parameters);
 			ArgumentNullException.ThrowIfNull(launchParameters);
 
-			var parametersString = String.Join(';', parameters.Select(kvp => $"{kvp.Key}={kvp.Value}"));
+			if (logFilePath != null)
+				throw new NotSupportedException("OpenDream does not support logging to a file!");
 
-			if (!String.IsNullOrEmpty(launchParameters.AdditionalParameters))
-			{
-				// TGS and BYOND expect url encoded params, OD takes unencoded
-				var unencodedAdditionalParams = String.Join(
-					';',
-					launchParameters
-						.AdditionalParameters
-						.Split('&')
-						.Select(
-							singleParam => String.Join(
-								'=',
-								singleParam
-									.Split('=')
-									.Select(
-										encodedParam => HttpUtility.UrlDecode(encodedParam)))));
-
-				parametersString = $"{parametersString};{unencodedAdditionalParams}";
-			}
+			var parametersString = EncodeParameters(parameters, launchParameters);
 
 			var arguments = $"--cvar net.port={launchParameters.Port.Value} --cvar opendream.topic_port=0 --cvar opendream.world_params=\"{parametersString}\" \"{dmbProvider.DmbName}\"";
 			return arguments;
 		}
 
 		/// <inheritdoc />
-		public string FormatCompilerArguments(string dmePath)
+		public override string FormatCompilerArguments(string dmePath)
 			=> $"--suppress-unimplemented --notices-enabled \"{dmePath ?? throw new ArgumentNullException(nameof(dmePath))}\"";
 	}
 }