diff --git a/export-windows.ps1 b/export-windows.ps1
index db29ddb..85b73d0 100644
--- a/export-windows.ps1
+++ b/export-windows.ps1
@@ -18,20 +18,16 @@ function Require-Environment([string]$Name) {
 }
 
 function Test-PathIsWithinDirectory([string]$ParentDirectory, [string]$CandidateDirectory) {
-    # [IO.Path]::GetRelativePath is not available in Windows PowerShell 5.1.
-    # Compare complete paths with a separator boundary so, for example,
-    # C:\workspace-other is not considered a child of C:\workspace.
     $parentPath = [IO.Path]::GetFullPath($ParentDirectory)
     $candidatePath = [IO.Path]::GetFullPath($CandidateDirectory)
-    $directorySeparator = [IO.Path]::DirectorySeparatorChar.ToString()
-    $alternateSeparator = [IO.Path]::AltDirectorySeparatorChar.ToString()
+    $separator = [IO.Path]::DirectorySeparatorChar.ToString()
 
     if ($candidatePath.Equals($parentPath, [StringComparison]::OrdinalIgnoreCase)) {
         return $true
     }
 
-    if (-not $parentPath.EndsWith($directorySeparator) -and -not $parentPath.EndsWith($alternateSeparator)) {
-        $parentPath += $directorySeparator
+    if (-not $parentPath.EndsWith($separator)) {
+        $parentPath += $separator
     }
 
     return $candidatePath.StartsWith($parentPath, [StringComparison]::OrdinalIgnoreCase)
@@ -42,6 +38,7 @@ function Get-ActualArchitecture {
     if ([string]::IsNullOrWhiteSpace($architecture)) {
         $architecture = $env:PROCESSOR_ARCHITECTURE
     }
+
     switch ($architecture.ToUpperInvariant()) {
         'AMD64' { return 'x86_64' }
         'X86' { return 'x86_32' }
@@ -51,49 +48,159 @@ function Get-ActualArchitecture {
 }
 
 function Get-Checksum([string]$ManifestPath, [string]$Asset) {
-    $line = Get-Content -LiteralPath $ManifestPath | Where-Object {
-        $_ -match '^([0-9A-Fa-f]{128})\s+\*?(.+)$' -and $Matches[2] -eq $Asset
-    } | Select-Object -First 1
-    if (-not $line) {
-        Fail "Godot $GodotVersion does not publish required $edition asset '$Asset' for Windows/$HostArch at $script:BaseUrl. Choose a supported stable release and architecture."
+    foreach ($line in Get-Content -LiteralPath $ManifestPath) {
+        if ($line -match '^([0-9A-Fa-f]{128})\s+\*?(.+)$' -and $Matches[2] -eq $Asset) {
+            return $Matches[1].ToLowerInvariant()
+        }
     }
-    return ($line -split '\s+')[0].ToLowerInvariant()
+
+    Fail "Godot $GodotVersion does not publish required $edition asset '$Asset' for Windows/$HostArch at $script:BaseUrl. Choose a supported stable release and architecture."
 }
 
 function Download-AndVerify([string]$Asset, [string]$Destination, [string]$ExpectedChecksum) {
-    Invoke-WebRequest -Uri "$script:BaseUrl/$Asset" -OutFile $Destination
-    $actual = (Get-FileHash -LiteralPath $Destination -Algorithm SHA512).Hash.ToLowerInvariant()
-    if ($actual -ne $ExpectedChecksum) {
+    Invoke-WebRequest -UseBasicParsing -Uri "$script:BaseUrl/$Asset" -OutFile $Destination
+    $actualChecksum = (Get-FileHash -LiteralPath $Destination -Algorithm SHA512).Hash.ToLowerInvariant()
+    if ($actualChecksum -ne $ExpectedChecksum) {
         Fail "SHA-512 verification failed for $Asset."
     }
 }
 
-function Find-Editor([string]$Directory) {
-    $console = Get-ChildItem -LiteralPath $Directory -Recurse -File -Filter 'Godot*console.exe' -ErrorAction SilentlyContinue | Select-Object -First 1
-    if ($console) { return $console.FullName }
-    $editor = Get-ChildItem -LiteralPath $Directory -Recurse -File -Filter 'Godot*.exe' -ErrorAction SilentlyContinue | Select-Object -First 1
-    if ($editor) { return $editor.FullName }
+function Get-CachePaths([string]$Root) {
+    $editorDirectory = Join-Path $Root 'editor'
+    $userHome = Join-Path $Root 'home'
+    $templateDirectory = Join-Path $userHome "AppData\Roaming\Godot\export_templates\$templateVersion"
+
+    return [PSCustomObject]@{
+        Root = $Root
+        EditorDirectory = $editorDirectory
+        UserHome = $userHome
+        TemplateDirectory = $templateDirectory
+        Marker = Join-Path $Root '.complete'
+    }
+}
+
+function Get-EditorExecutable([string]$EditorDirectory) {
+    $matches = @(Get-ChildItem -LiteralPath $EditorDirectory -Recurse -File -ErrorAction SilentlyContinue |
+        Where-Object { $_.Name -eq $expectedEditorFileName })
+
+    if ($matches.Count -eq 1) {
+        return $matches[0].FullName
+    }
+
     return $null
 }
 
-function Install-ExportTemplates([string]$StagingDirectory, [string]$TemplateDirectory, [string]$TemplateAsset, [string]$ExpectedVersion) {
+function Get-PeMachine([string]$Path) {
+    try {
+        $bytes = [IO.File]::ReadAllBytes($Path)
+    } catch {
+        return $null
+    }
+
+    if ($bytes.Length -lt 64 -or $bytes[0] -ne 0x4d -or $bytes[1] -ne 0x5a) {
+        return $null
+    }
+
+    $peOffset = [BitConverter]::ToInt32($bytes, 0x3c)
+    if ($peOffset -lt 0 -or $peOffset -gt ($bytes.Length - 6)) {
+        return $null
+    }
+
+    if ($bytes[$peOffset] -ne 0x50 -or $bytes[$peOffset + 1] -ne 0x45 -or $bytes[$peOffset + 2] -ne 0 -or $bytes[$peOffset + 3] -ne 0) {
+        return $null
+    }
+
+    return [BitConverter]::ToUInt16($bytes, $peOffset + 4)
+}
+
+function Test-ExpectedEditor([string]$EditorDirectory) {
+    $editorExecutable = Get-EditorExecutable $EditorDirectory
+    if (-not $editorExecutable) {
+        return $false
+    }
+
+    return (Get-PeMachine $editorExecutable) -eq $expectedPeMachine
+}
+
+function Assert-ExpectedEditor([string]$EditorDirectory) {
+    $editorExecutable = Get-EditorExecutable $EditorDirectory
+    if (-not $editorExecutable) {
+        Fail "The Godot editor archive did not contain the expected console executable '$expectedEditorFileName'."
+    }
+
+    $machine = Get-PeMachine $editorExecutable
+    if ($machine -ne $expectedPeMachine) {
+        Fail "The expected Godot console executable '$expectedEditorFileName' is not a valid $HostArch Windows executable."
+    }
+
+    return $editorExecutable
+}
+
+function Test-ValidCache($Paths) {
+    if (-not (Test-Path -LiteralPath $Paths.Marker -PathType Leaf)) {
+        return $false
+    }
+
+    $installedVersion = Join-Path $Paths.TemplateDirectory 'version.txt'
+    if (-not (Test-Path -LiteralPath $installedVersion -PathType Leaf)) {
+        return $false
+    }
+
+    if ((Get-Content -LiteralPath $installedVersion -Raw).Trim() -ne $templateVersion) {
+        return $false
+    }
+
+    return Test-ExpectedEditor $Paths.EditorDirectory
+}
+
+function Install-ExportTemplates($Paths, [string]$StagingDirectory, [string]$TemplateAsset) {
     $stagedTemplates = Join-Path $StagingDirectory 'templates'
     $stagedVersion = Join-Path $stagedTemplates 'version.txt'
     if (-not (Test-Path -LiteralPath $stagedVersion -PathType Leaf)) {
         Fail "The export-template archive '$TemplateAsset' did not contain templates/version.txt."
     }
+
     $actualVersion = (Get-Content -LiteralPath $stagedVersion -Raw).Trim()
-    if ($actualVersion -ne $ExpectedVersion) {
-        Fail "The export-template archive '$TemplateAsset' reports template version '$actualVersion', expected '$ExpectedVersion'."
+    if ($actualVersion -ne $templateVersion) {
+        Fail "The export-template archive '$TemplateAsset' reports template version '$actualVersion', expected '$templateVersion'."
     }
-    New-Item -ItemType Directory -Force -Path $TemplateDirectory | Out-Null
-    Get-ChildItem -LiteralPath $stagedTemplates -Force | Copy-Item -Destination $TemplateDirectory -Recurse -Force
-    Remove-Item -LiteralPath $StagingDirectory -Recurse -Force
-    if (-not (Test-Path -LiteralPath (Join-Path $TemplateDirectory 'version.txt') -PathType Leaf)) {
-        Fail "The export-template archive '$TemplateAsset' could not be installed to '$TemplateDirectory'."
+
+    New-Item -ItemType Directory -Force -Path $Paths.TemplateDirectory | Out-Null
+    Get-ChildItem -LiteralPath $stagedTemplates -Force | Copy-Item -Destination $Paths.TemplateDirectory -Recurse -Force
+
+    if (-not (Test-Path -LiteralPath (Join-Path $Paths.TemplateDirectory 'version.txt') -PathType Leaf)) {
+        Fail "The export-template archive '$TemplateAsset' could not be installed to '$($Paths.TemplateDirectory)'."
     }
 }
 
+function Install-Cache($Paths) {
+    New-Item -ItemType Directory -Force -Path $Paths.EditorDirectory | Out-Null
+
+    $manifestPath = Join-Path $Paths.Root 'SHA512-SUMS.txt'
+    $editorArchive = Join-Path $Paths.Root $editorAsset
+    $templatesArchive = Join-Path $Paths.Root $templatesAsset
+    $templatesZipArchive = Join-Path $Paths.Root 'export-templates.zip'
+    $templatesStagingDirectory = Join-Path $Paths.Root 'templates-staging'
+
+    Invoke-WebRequest -UseBasicParsing -Uri "$script:BaseUrl/SHA512-SUMS.txt" -OutFile $manifestPath
+    $editorChecksum = Get-Checksum $manifestPath $editorAsset
+    $templatesChecksum = Get-Checksum $manifestPath $templatesAsset
+    Download-AndVerify $editorAsset $editorArchive $editorChecksum
+    Download-AndVerify $templatesAsset $templatesArchive $templatesChecksum
+
+    Expand-Archive -LiteralPath $editorArchive -DestinationPath $Paths.EditorDirectory -Force
+    Assert-ExpectedEditor $Paths.EditorDirectory | Out-Null
+
+    # Expand-Archive only recognizes .zip files. The verified .tpz payload is a ZIP archive.
+    Move-Item -LiteralPath $templatesArchive -Destination $templatesZipArchive
+    Expand-Archive -LiteralPath $templatesZipArchive -DestinationPath $templatesStagingDirectory -Force
+    Install-ExportTemplates $Paths $templatesStagingDirectory $templatesAsset
+    Remove-Item -LiteralPath $templatesStagingDirectory -Recurse -Force
+
+    @("release=$GodotVersion", "editor=$editorAsset", "templates=$templatesAsset") |
+        Set-Content -LiteralPath $Paths.Marker -NoNewline
+}
+
 $GodotVersion = Require-Environment 'GODOT_VERSION'
 $HostOs = Require-Environment 'GODOT_HOST_OS'
 $HostArch = Require-Environment 'GODOT_HOST_ARCH'
@@ -113,7 +220,9 @@ if ($ExportMode -notin @('release', 'debug')) { Fail "export-mode must be 'relea
 if ([string]::IsNullOrWhiteSpace($ExportPreset)) { Fail 'export-preset must not be empty.' }
 if ([string]::IsNullOrWhiteSpace($ExportFileName) -or $ExportFileName -in @('.', '..') -or $ExportFileName.IndexOfAny([IO.Path]::GetInvalidFileNameChars()) -ge 0 -or $ExportFileName.Contains('/') -or $ExportFileName.Contains('\')) { Fail 'export-file-name must be a filename without path separators.' }
 if ($HostArch -notin @('x86_32', 'x86_64', 'arm64')) { Fail "Unsupported Windows host-arch '$HostArch'." }
-if ($HostArch -ne (Get-ActualArchitecture)) { Fail "host-arch '$HostArch' does not match this Windows runner ($(Get-ActualArchitecture))." }
+
+$actualArchitecture = Get-ActualArchitecture
+if ($HostArch -ne $actualArchitecture) { Fail "host-arch '$HostArch' does not match this Windows runner ($actualArchitecture)." }
 
 $workspaceDirectory = [IO.Path]::GetFullPath($Workspace)
 if ([IO.Path]::IsPathRooted($ProjectPath)) { Fail 'project-path must be relative to the checked-out workspace.' }
@@ -126,69 +235,71 @@ if (-not (Select-String -LiteralPath $PresetFile -SimpleMatch "name=`"$ExportPre
 
 if ($Dotnet -eq 'true') {
     $edition = 'dotnet'
-    $editorAsset = switch ($HostArch) {
-        'x86_32' { "Godot_v${GodotVersion}_mono_win32.zip" }
-        'x86_64' { "Godot_v${GodotVersion}_mono_win64.zip" }
-        'arm64' { "Godot_v${GodotVersion}_mono_windows_arm64.zip" }
+    $editorBaseName = switch ($HostArch) {
+        'x86_32' { "Godot_v${GodotVersion}_mono_win32" }
+        'x86_64' { "Godot_v${GodotVersion}_mono_win64" }
+        'arm64' { "Godot_v${GodotVersion}_mono_windows_arm64" }
     }
+    $editorAsset = "$editorBaseName.zip"
     $templatesAsset = "Godot_v${GodotVersion}_mono_export_templates.tpz"
     $templateVersion = ($GodotVersion -replace '-', '.') + '.mono'
 } else {
     $edition = 'standard'
-    $editorAsset = switch ($HostArch) {
-        'x86_32' { "Godot_v${GodotVersion}_win32.exe.zip" }
-        'x86_64' { "Godot_v${GodotVersion}_win64.exe.zip" }
-        'arm64' { "Godot_v${GodotVersion}_windows_arm64.exe.zip" }
+    $editorBaseName = switch ($HostArch) {
+        'x86_32' { "Godot_v${GodotVersion}_win32" }
+        'x86_64' { "Godot_v${GodotVersion}_win64" }
+        'arm64' { "Godot_v${GodotVersion}_windows_arm64" }
     }
+    $editorAsset = "$editorBaseName.exe.zip"
     $templatesAsset = "Godot_v${GodotVersion}_export_templates.tpz"
     $templateVersion = $GodotVersion -replace '-', '.'
 }
 
+$expectedEditorFileName = "${editorBaseName}_console.exe"
+$expectedPeMachine = switch ($HostArch) {
+    'x86_32' { [uint16]0x014c }
+    'x86_64' { [uint16]0x8664 }
+    'arm64' { [uint16]0xaa64 }
+}
+
 $script:BaseUrl = "https://github.com/godotengine/godot/releases/download/$GodotVersion"
 $cacheDirectory = Join-Path $ActionRoot "cache\$GodotVersion\$edition\windows-$HostArch"
-$editorDirectory = Join-Path $cacheDirectory 'editor'
-$userHome = Join-Path $cacheDirectory 'home'
-$templateDirectory = Join-Path $userHome "AppData\Roaming\Godot\export_templates\$templateVersion"
-$marker = Join-Path $cacheDirectory '.complete'
+$cachePaths = Get-CachePaths $cacheDirectory
 
-$editorExecutable = $null
-if ((Test-Path -LiteralPath $marker -PathType Leaf) -and (Test-Path -LiteralPath (Join-Path $templateDirectory 'version.txt') -PathType Leaf)) {
-    $editorExecutable = Find-Editor $editorDirectory
-}
+if (-not (Test-ValidCache $cachePaths)) {
+    $cacheParent = Split-Path -Parent $cacheDirectory
+    $stagingDirectory = Join-Path $cacheParent ((Split-Path -Leaf $cacheDirectory) + ".staging-$PID")
+    if (Test-Path -LiteralPath $stagingDirectory) { Remove-Item -LiteralPath $stagingDirectory -Recurse -Force }
+    New-Item -ItemType Directory -Force -Path $cacheParent | Out-Null
 
-if (-not $editorExecutable) {
-    if (Test-Path -LiteralPath $cacheDirectory) { Remove-Item -LiteralPath $cacheDirectory -Recurse -Force }
-    New-Item -ItemType Directory -Force -Path $editorDirectory | Out-Null
-    $manifestPath = Join-Path $cacheDirectory 'SHA512-SUMS.txt'
-    $editorArchive = Join-Path $cacheDirectory $editorAsset
-    $templatesArchive = Join-Path $cacheDirectory $templatesAsset
-    $templatesZipArchive = Join-Path $cacheDirectory ($templatesAsset -replace '\.tpz$', '.zip')
-    $templatesStagingDirectory = Join-Path $cacheDirectory 'templates-staging'
-    Invoke-WebRequest -Uri "$script:BaseUrl/SHA512-SUMS.txt" -OutFile $manifestPath
-    $editorChecksum = Get-Checksum $manifestPath $editorAsset
-    $templatesChecksum = Get-Checksum $manifestPath $templatesAsset
-    Download-AndVerify $editorAsset $editorArchive $editorChecksum
-    Download-AndVerify $templatesAsset $templatesArchive $templatesChecksum
-    Expand-Archive -LiteralPath $editorArchive -DestinationPath $editorDirectory -Force
-    Move-Item -LiteralPath $templatesArchive -Destination $templatesZipArchive
-    Expand-Archive -LiteralPath $templatesZipArchive -DestinationPath $templatesStagingDirectory -Force
-    Install-ExportTemplates $templatesStagingDirectory $templateDirectory $templatesAsset $templateVersion
-    $editorExecutable = Find-Editor $editorDirectory
-    if (-not $editorExecutable) { Fail 'The Godot editor archive did not contain an executable.' }
-    if (-not (Test-Path -LiteralPath (Join-Path $templateDirectory 'version.txt') -PathType Leaf)) { Fail 'The export-template archive did not contain version.txt.' }
-    @("release=$GodotVersion", "editor=$editorAsset", "templates=$templatesAsset") | Set-Content -LiteralPath $marker -NoNewline
+    try {
+        $stagingPaths = Get-CachePaths $stagingDirectory
+        Install-Cache $stagingPaths
+        if (-not (Test-ValidCache $stagingPaths)) { Fail 'Godot cache installation did not pass validation.' }
+        if (Test-Path -LiteralPath $cacheDirectory) { Remove-Item -LiteralPath $cacheDirectory -Recurse -Force }
+        Move-Item -LiteralPath $stagingDirectory -Destination $cacheDirectory
+    } finally {
+        if (Test-Path -LiteralPath $stagingDirectory) { Remove-Item -LiteralPath $stagingDirectory -Recurse -Force }
+    }
 }
 
+$editorExecutable = Assert-ExpectedEditor $cachePaths.EditorDirectory
 $safePreset = ($ExportPreset -replace '[^A-Za-z0-9_.-]', '_').Trim('_')
 if ([string]::IsNullOrWhiteSpace($safePreset)) { $safePreset = 'export' }
 $buildDirectory = Join-Path $ActionRoot "builds\$safePreset-$ExportMode-$PID"
 $outputFile = Join-Path $buildDirectory $ExportFileName
 New-Item -ItemType Directory -Force -Path $buildDirectory | Out-Null
 
-$env:USERPROFILE = $userHome
-$env:APPDATA = Join-Path $userHome 'AppData\Roaming'
-$env:LOCALAPPDATA = Join-Path $userHome 'AppData\Local'
-& $editorExecutable --headless --path $ProjectDirectory "--export-$ExportMode" $ExportPreset $outputFile
+$env:USERPROFILE = $cachePaths.UserHome
+$env:APPDATA = Join-Path $cachePaths.UserHome 'AppData\Roaming'
+$env:LOCALAPPDATA = Join-Path $cachePaths.UserHome 'AppData\Local'
+
+try {
+    & $editorExecutable --headless --path $ProjectDirectory "--export-$ExportMode" $ExportPreset $outputFile
+} catch {
+    Fail "Godot could not start '$editorExecutable': $($_.Exception.Message)"
+}
+
 if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
 if (-not (Test-Path -LiteralPath $outputFile)) { Fail "Godot completed without creating the expected output '$ExportFileName'." }