diff --git a/modules/mono/editor/Godot.NET.Sdk/Godot.NET.Sdk/Sdk/Sdk.props b/modules/mono/editor/Godot.NET.Sdk/Godot.NET.Sdk/Sdk/Sdk.props
index eea7520b05c..894053c5de1 100644
--- a/modules/mono/editor/Godot.NET.Sdk/Godot.NET.Sdk/Sdk/Sdk.props
+++ b/modules/mono/editor/Godot.NET.Sdk/Godot.NET.Sdk/Sdk/Sdk.props
@@ -14,7 +14,7 @@
 
     <GodotProjectDir Condition=" '$(GodotProjectDir)' == '' ">$(MSBuildProjectDirectory)</GodotProjectDir>
     <GodotProjectDir>$([MSBuild]::EnsureTrailingSlash('$(GodotProjectDir)'))</GodotProjectDir>
-    <GodotProjectDirBase64>$([MSBuild]::ConvertToBase64('$(GodotProjectDir)'))</GodotProjectDirBase64>
+    <GodotProjectDirBase64 Condition=" $([MSBuild]::VersionGreaterThanOrEquals($(MSBuildAssemblyVersion), '17.3')) ">$([MSBuild]::ConvertToBase64('$(GodotProjectDir)'))</GodotProjectDirBase64>
 
     <!-- Custom output paths for Godot projects. In brief, 'bin\' and 'obj\' are moved to '$(GodotProjectDir)\.godot\mono\temp\'. -->
     <BaseOutputPath>$(GodotProjectDir).godot\mono\temp\bin\</BaseOutputPath>
@@ -30,6 +30,13 @@
     <AppendTargetFrameworkToOutputPath>false</AppendTargetFrameworkToOutputPath>
   </PropertyGroup>
 
+  <Target Condition=" $([MSBuild]::VersionLessThan($(MSBuildAssemblyVersion), '17.3')) " Name="GodotProjectDir" BeforeTargets="Build">
+    <Error Text="Cannot build from path containing '%23', move your project or update dotnet to the latest version." Condition="$(GodotProjectDir.Contains('%23'))" /> <!-- # -->
+    <Error Text="Cannot build from path containing '%3B', move your project or update dotnet to the latest version." Condition="$(GodotProjectDir.Contains('%3B'))" /> <!-- ; -->
+    <Error Text="Cannot build from path containing newlines, move your project or update dotnet to the latest version." Condition="$(GodotProjectDir.Contains('%0A'))" /> <!-- \n -->
+    <Error Text="Cannot build from path containing newlines, move your project or update dotnet to the latest version." Condition="$(GodotProjectDir.Contains('%0D'))" /> <!-- \r -->
+  </Target>
+
   <Import Sdk="Microsoft.NET.Sdk" Project="Sdk.props" Condition=" '$(GodotSdkImportsMicrosoftNetSdk)' == 'true' " />
 
   <PropertyGroup>
diff --git a/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators.Sample/Godot.SourceGenerators.Sample.csproj b/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators.Sample/Godot.SourceGenerators.Sample.csproj
index 2df838cfb8e..3f569ebac3f 100644
--- a/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators.Sample/Godot.SourceGenerators.Sample.csproj
+++ b/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators.Sample/Godot.SourceGenerators.Sample.csproj
@@ -7,7 +7,7 @@
   <PropertyGroup>
     <!-- $(GodotProjectDir) would normally be defined by the Godot.NET.Sdk -->
     <GodotProjectDir>$(MSBuildProjectDirectory)</GodotProjectDir>
-    <GodotProjectDirBase64>$([MSBuild]::ConvertToBase64('$(GodotProjectDir)'))</GodotProjectDirBase64>
+    <GodotProjectDirBase64 Condition=" $([MSBuild]::VersionGreaterThanOrEquals($(MSBuildAssemblyVersion), '17.3')) ">$([MSBuild]::ConvertToBase64('$(GodotProjectDir)'))</GodotProjectDirBase64>
     <!-- For compiling GetGodotPropertyDefaultValues. -->
     <DefineConstants>$(DefineConstants);TOOLS</DefineConstants>
   </PropertyGroup>