Add winget repair helper and remove winget configure --enable prerequisite

Initialize-Winget.ps1 refreshes PATH, re-registers App Installer and
falls back to the provisioned package before exiting with a Store link.
All scripts that call winget now dot-source this helper instead of
failing on a missing winget.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

powershell/Initialize-Winget.ps1

@@ -0,0 +1,72 @@
+# Shared helper: ensures winget is accessible before use.
+# Dot-source this script and call Initialize-Winget at startup.
+# Repair operations require administrator rights.
+
+function Initialize-Winget {
+    if (Get-Command winget -ErrorAction SilentlyContinue) {
+        return
+    }
+
+    Write-Host "winget not found in PATH. Attempting repair..." -ForegroundColor Yellow
+
+    # Refresh PATH from registry in case a recent install is not yet visible
+    $MachinePath = [System.Environment]::GetEnvironmentVariable("PATH", "Machine")
+    $UserPath    = [System.Environment]::GetEnvironmentVariable("PATH", "User")
+    $env:PATH    = $MachinePath + ";" + $UserPath
+
+    if (Get-Command winget -ErrorAction SilentlyContinue) {
+        Write-Host "winget available after PATH refresh." -ForegroundColor Green
+        return
+    }
+
+    # Try to re-register the installed App Installer package
+    $AppInstaller = Get-AppxPackage -Name "Microsoft.DesktopAppInstaller" -ErrorAction SilentlyContinue
+    if (-not $AppInstaller) {
+        $AppInstaller = Get-AppxPackage -AllUsers -Name "Microsoft.DesktopAppInstaller" -ErrorAction SilentlyContinue
+    }
+
+    if ($AppInstaller) {
+        Write-Host "Re-registering App Installer..." -ForegroundColor Yellow
+        try {
+            $Manifest = Join-Path $AppInstaller.InstallLocation "AppxManifest.xml"
+            Add-AppxPackage -DisableDevelopmentMode -Register $Manifest -ErrorAction Stop
+            $env:PATH = [System.Environment]::GetEnvironmentVariable("PATH", "Machine") + ";" +
+                        [System.Environment]::GetEnvironmentVariable("PATH", "User")
+
+            if (Get-Command winget -ErrorAction SilentlyContinue) {
+                Write-Host "winget repaired." -ForegroundColor Green
+                return
+            }
+        }
+        catch {
+            Write-Warning "Re-registration failed: $_"
+        }
+    }
+
+    # Try to reinstall from the provisioned (staged) package on this machine
+    $StagedPackage = Get-AppxProvisionedPackage -Online -ErrorAction SilentlyContinue |
+        Where-Object { $_.DisplayName -eq "Microsoft.DesktopAppInstaller" } |
+        Select-Object -First 1
+
+    if ($StagedPackage) {
+        Write-Host "Installing App Installer from provisioned package..." -ForegroundColor Yellow
+        try {
+            Add-AppxPackage -Path $StagedPackage.PackagePath -ErrorAction Stop
+            $env:PATH = [System.Environment]::GetEnvironmentVariable("PATH", "Machine") + ";" +
+                        [System.Environment]::GetEnvironmentVariable("PATH", "User")
+
+            if (Get-Command winget -ErrorAction SilentlyContinue) {
+                Write-Host "winget installed." -ForegroundColor Green
+                return
+            }
+        }
+        catch {
+            Write-Warning "Installation from provisioned package failed: $_"
+        }
+    }
+
+    Write-Error ("winget is not available and could not be repaired automatically.`n" +
+                 "Install App Installer from the Microsoft Store: " +
+                 "ms-windows-store://pdp/?productid=9nblggh4nns1")
+    exit 1
+}

powershell/Install-Firefox.ps1

@@ -9,6 +9,8 @@ param(
 
 $ErrorActionPreference = "Stop"
 
+. (Join-Path $PSScriptRoot "Initialize-Winget.ps1")
+
 $IsAdministrator = ([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole(
     [Security.Principal.WindowsBuiltInRole]::Administrator
 )
@@ -23,10 +25,7 @@ function Install-FirefoxEsr {
         [string]$PackageId
     )
 
-    if (-not (Get-Command winget -ErrorAction SilentlyContinue)) {
-        Write-Error "winget was not found. Install App Installer or enable winget before running this script."
-        exit 1
-    }
+    Initialize-Winget
 
     Write-Host "Installing Firefox ESR with winget: $PackageId" -ForegroundColor Cyan
 

powershell/Winget-Remove-BuiltInApps.ps1

@@ -1,6 +1,9 @@
 # Requires running as administrator
 # Uninstalling Windows applications via winget
 
+. (Join-Path $PSScriptRoot "Initialize-Winget.ps1")
+Initialize-Winget
+
 $Packages = @(
     "Windows Web Experience Pack",
     "Xbox",

powershell/libres-softwares-install.ps1

@@ -1,12 +1,8 @@
 # Script d'installation de logiciels avec winget
 # Permet de choisir les logiciels a installer
 
-# Verification que winget est installe
-if (-not (Get-Command winget -ErrorAction SilentlyContinue)) {
-    Write-Host "ERREUR: winget n'est pas installe sur ce systeme." -ForegroundColor Red
-    Write-Host "Veuillez installer le 'App Installer' depuis le Microsoft Store." -ForegroundColor Yellow
-    exit 1
-}
+. (Join-Path $PSScriptRoot "Initialize-Winget.ps1")
+Initialize-Winget
 
 Write-Host "===========================================================" -ForegroundColor Cyan
 Write-Host "   Script d'installation de logiciels avec winget" -ForegroundColor Cyan