diff --git a/src/Velopack.Packaging.Windows/Commands/WindowsPackCommandRunner.cs b/src/Velopack.Packaging.Windows/Commands/WindowsPackCommandRunner.cs
index 830dec8d..0db992c2 100644
--- a/src/Velopack.Packaging.Windows/Commands/WindowsPackCommandRunner.cs
+++ b/src/Velopack.Packaging.Windows/Commands/WindowsPackCommandRunner.cs
@@ -72,8 +72,9 @@ public class WindowsPackCommandRunner : PackageBuilder<WindowsPackOptions>
         File.Copy(updatePath, Path.Combine(packDir, "Squirrel.exe"), true);
 
         // create a stub for portable packages
-        var mainPath = Path.Combine(packDir, MainExeName);
-        var stubPath = Path.Combine(packDir, Path.GetFileNameWithoutExtension(MainExeName) + "_ExecutionStub.exe");
+        var mainExeName = Options.EntryExecutableName;
+        var mainPath = Path.Combine(packDir, mainExeName);
+        var stubPath = Path.Combine(packDir, Path.GetFileNameWithoutExtension(mainExeName) + "_ExecutionStub.exe");
         CreateExecutableStubForExe(mainPath, stubPath);
 
         return Task.FromResult(packDir);
@@ -205,7 +206,8 @@ public class WindowsPackCommandRunner : PackageBuilder<WindowsPackOptions>
         File.Delete(Path.Combine(current.FullName, "Squirrel.exe"));
 
         // move the stub to the root of the portable package
-        var stubPath = Path.Combine(current.FullName, Path.GetFileNameWithoutExtension(MainExeName) + "_ExecutionStub.exe");
+        var stubPath = Path.Combine(current.FullName,
+            Path.GetFileNameWithoutExtension(Options.EntryExecutableName) + "_ExecutionStub.exe");
         var stubName = (Options.PackTitle ?? Options.PackId) + ".exe";
         File.Move(stubPath, Path.Combine(dir.FullName, stubName));
 
diff --git a/src/Velopack.Packaging/Abstractions/INugetPackCommand.cs b/src/Velopack.Packaging/Abstractions/INugetPackCommand.cs
index 449e2bed..c2563227 100644
--- a/src/Velopack.Packaging/Abstractions/INugetPackCommand.cs
+++ b/src/Velopack.Packaging/Abstractions/INugetPackCommand.cs
@@ -2,10 +2,10 @@
 
 public interface INugetPackCommand
 {
-    string PackId { get; }
-    string PackVersion { get; }
-    string PackDirectory { get; }
-    string PackAuthors { get; }
-    string PackTitle { get; }
-    string ReleaseNotes { get; }
+    string PackId { get; set; }
+    string PackVersion { get; set; }
+    string PackDirectory { get; set; }
+    string PackAuthors { get; set; }
+    string PackTitle { get; set; }
+    string ReleaseNotes { get; set; }
 }
diff --git a/src/Velopack.Packaging/Abstractions/IPackOptions.cs b/src/Velopack.Packaging/Abstractions/IPackOptions.cs
index 69744b42..9b2fb687 100644
--- a/src/Velopack.Packaging/Abstractions/IPackOptions.cs
+++ b/src/Velopack.Packaging/Abstractions/IPackOptions.cs
@@ -2,11 +2,11 @@
 
 public interface IPackOptions : INugetPackCommand, IPlatformOptions
 {
-    string Channel { get; }
-    DeltaMode DeltaMode { get; }
-    string EntryExecutableName { get; }
-    string Icon { get; }
-    string Exclude { get; }
-    bool NoPortable { get; }
-    bool NoInst { get; }
+    string Channel { get; set; }
+    DeltaMode DeltaMode { get; set; }
+    string EntryExecutableName { get; set; }
+    string Icon { get; set; }
+    string Exclude { get; set; }
+    bool NoPortable { get; set; }
+    bool NoInst { get; set; }
 }
diff --git a/src/Velopack.Packaging/Abstractions/IPlatformOptions.cs b/src/Velopack.Packaging/Abstractions/IPlatformOptions.cs
index 6875bd58..d7267262 100644
--- a/src/Velopack.Packaging/Abstractions/IPlatformOptions.cs
+++ b/src/Velopack.Packaging/Abstractions/IPlatformOptions.cs
@@ -1,6 +1,6 @@
-namespace Velopack.Packaging.Abstractions;
+namespace Velopack.Packaging.Abstractions;
 
 public interface IPlatformOptions : IOutputOptions
 {
-    RID TargetRuntime { get; }
+    RID TargetRuntime { get; set; }
 }
diff --git a/src/Velopack.Packaging/PackageBuilder.cs b/src/Velopack.Packaging/PackageBuilder.cs
index e9745ca9..983b3b34 100644
--- a/src/Velopack.Packaging/PackageBuilder.cs
+++ b/src/Velopack.Packaging/PackageBuilder.cs
@@ -24,12 +24,8 @@ public abstract class PackageBuilder<T> : ICommand<T>
 
     protected T Options { get; private set; }
 
-    protected string MainExeName { get; private set; }
-
     protected string MainExePath { get; private set; }
 
-    protected string Channel { get; private set; }
-
     protected Dictionary<string, string> ExtraNuspecMetadata { get; } = new();
 
     private readonly Regex REGEX_EXCLUDES = new Regex(@".*[\\\/]createdump.*|.*\.vshost\..*|.*\.nupkg$", RegexOptions.IgnoreCase | RegexOptions.Compiled);
@@ -43,7 +39,11 @@ public abstract class PackageBuilder<T> : ICommand<T>
 
     public async Task Run(T options)
     {
-        if (options.TargetRuntime?.BaseRID != TargetOs) {
+        if (options.TargetRuntime == null) {
+            options.TargetRuntime = RID.Parse(TargetOs.GetOsShortName());
+        }
+
+        if (options.TargetRuntime.BaseRID != TargetOs) {
             throw new UserInfoException($"To build packages for {TargetOs.GetOsLongName()}, " +
                 $"the target rid must be {TargetOs} (actually was {options.TargetRuntime?.BaseRID}). " +
                 $"If your real intention was to cross-compile a release for {options.TargetRuntime?.BaseRID} then you " +
@@ -55,7 +55,7 @@ public abstract class PackageBuilder<T> : ICommand<T>
 
         var releaseDir = options.ReleaseDir;
         var channel = options.Channel?.ToLower() ?? ReleaseEntryHelper.GetDefaultChannel(TargetOs);
-        Channel = channel;
+        options.Channel = channel;
 
         var entryHelper = new ReleaseEntryHelper(releaseDir.FullName, channel, Log, TargetOs);
         if (entryHelper.DoesSimilarVersionExist(SemanticVersion.Parse(options.PackVersion))) {
@@ -89,7 +89,7 @@ public abstract class PackageBuilder<T> : ICommand<T>
         }
 
         MainExePath = mainExePath;
-        MainExeName = Path.GetFileName(mainExePath);
+        options.EntryExecutableName = Path.GetFileName(mainExePath);
 
         using var _1 = Utility.GetTempDirectory(out var pkgTempDir);
         TempDir = new DirectoryInfo(pkgTempDir);
@@ -221,8 +221,8 @@ public abstract class PackageBuilder<T> : ICommand<T>
 <description>{packTitle ?? packId}</description>
 <authors>{packAuthors ?? packId}</authors>
 <version>{packVersion}</version>
-<channel>{Channel}</channel>
-<mainExe>{MainExeName}</mainExe>
+<channel>{Options.Channel}</channel>
+<mainExe>{Options.EntryExecutableName}</mainExe>
 <os>{rid.BaseRID.GetOsShortName()}</os>
 <rid>{rid.ToDisplay(RidDisplayType.NoVersion)}</rid>
 {extraMetadata.Trim()}
diff --git a/src/Velopack.Vpk/OptionMapper.cs b/src/Velopack.Vpk/OptionMapper.cs
index 0d280525..7285eb4c 100644
--- a/src/Velopack.Vpk/OptionMapper.cs
+++ b/src/Velopack.Vpk/OptionMapper.cs
@@ -37,10 +37,15 @@ public static partial class OptionMapper
 
     private static DirectoryInfo StringToDirectoryInfo(string t)
     {
+        if (t == null) return null;
         var di = new DirectoryInfo(t);
         if (!di.Exists) di.Create();
         return di;
     }
 
-    private static RID StringToRID(string t) => RID.Parse(t);
+    private static RID StringToRID(string t)
+    {
+        if (t == null) return null;
+        return RID.Parse(t);
+    }
 }