diff --git a/.gitignore b/.gitignore
index 0a42b42e5..eef95bde6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -423,4 +423,10 @@ Minecraft.World/x64_Debug/
 Minecraft.World/Release/
 Minecraft.World/x64_Release/
 
-build/*
\ No newline at end of file
+build/*
+
+# Existing build output files
+!x64/**/Effects.msscmp
+!x64/**/iggy_w64.dll
+!x64/**/mss64.dll
+!x64/**/redist64/
diff --git a/Minecraft.Client/postbuild.ps1 b/Minecraft.Client/postbuild.ps1
index a4c6cc346..1c965758a 100644
--- a/Minecraft.Client/postbuild.ps1
+++ b/Minecraft.Client/postbuild.ps1
@@ -36,6 +36,7 @@ foreach ($copy in $copies) {
     $dst = Join-Path $OutDir $copy.Dest
 
     if (Test-Path $src) {
-		xcopy /q /y /i /s /e "$src" "$dst" 2>$null
+        # Copy the files using xcopy, forcing overwrite and suppressing errors, and only copying if the source is newer than the destination
+		xcopy /q /y /i /s /e /d "$src" "$dst" 2>$null
     }
 }