diff --git a/.github/workflows/windows-msi.yml b/.github/workflows/windows-msi.yml
index 92ae8c025..d18b956b5 100644
--- a/.github/workflows/windows-msi.yml
+++ b/.github/workflows/windows-msi.yml
@@ -115,7 +115,10 @@ jobs:
           # Install WixUI extension
           wix extension add WixToolset.UI.wixext/7.0.0
 
-          Write-Host "WiX v7 installed, EULA accepted, UI extension added."
+          # Install WixUtil extension (required for custom actions: Binary:Wix4UtilCA_*)
+          wix extension add WixToolset.Util.wixext/7.0.0
+
+          Write-Host "WiX v7 installed, EULA accepted, UI + Util extensions added."
 
       # ----------------------------------------------------------------
       # 5. Check that the WXS file exists in the repository
@@ -256,6 +259,7 @@ jobs:
             -d "FilesDir=$filesDir" `
             -d "LicenseRtf=$licRtf" `
             -ext WixToolset.UI.wixext `
+            -ext WixToolset.Util.wixext `
             -o "dist\$outputName"
 
           if (-not (Test-Path "dist\$outputName")) {