diff --git a/home/util/fh5-car-table.nix b/home/util/fh5-car-table.nix
index 1b4531b..f884786 100644
--- a/home/util/fh5-car-table.nix
+++ b/home/util/fh5-car-table.nix
@@ -1,7 +1,6 @@
 {
   stdenvNoCC,
   fetchurl,
-  makeWrapper,
   protontricks,
 }:
 stdenvNoCC.mkDerivation {
@@ -15,12 +14,22 @@ stdenvNoCC.mkDerivation {
 
   dontUnpack = true;
 
-  nativeBuildInputs = [ makeWrapper ];
-
   installPhase = ''
-    mkdir -p $out/bin
-    install -m 755 $src $out/bin/Car-Table.exe
-    makeWrapper ${protontricks}/bin/protontricks-launch $out/bin/fh5-car-table \
-      --add-flags "--appid 1551360 $out/bin/Car-Table.exe"
+        mkdir -p $out/bin
+        install -m 755 $src $out/bin/Car-Table.exe
+
+        cat > $out/bin/fh5-car-table <<'SCRIPT'
+    #!/usr/bin/env bash
+    PREFIX="$HOME/.local/share/Steam/steamapps/compatdata/1551360/pfx"
+    SENTINEL="$PREFIX/.fh5-car-table-dotnet7-installed"
+
+    if [[ ! -f "$SENTINEL" ]]; then
+        ${protontricks}/bin/protontricks 1551360 -q dotnetdesktop7
+        mkdir -p "$(dirname "$SENTINEL")"
+        touch "$SENTINEL"
+    fi
+    exec ${protontricks}/bin/protontricks-launch --appid 1551360 "$out/bin/Car-Table.exe" "$@"
+    SCRIPT
+        chmod +x $out/bin/fh5-car-table
   '';
 }