Not path.

Author: trisyoungs

.github/workflows/build/windows/action.yml

@@ -66,10 +66,10 @@ runs:
     run: |
       cd frontend
 
-      Qt6_DIR="${RUNNER_TEMP}/qt/${{ env.qtVersion }}/msvc2019_64"
+      Qt6_DIR="${RUNNER_TEMP}\qt\${{ env.qtVersion }}\msvc2019_64"
       export PATH="${Qt6_DIR}\bin;$PATH"
       echo $Qt6_DIR
-      ls $QT6_DIR
+      ls $Qt6_DIR
 
       mkdir build && cd build