functional enough

fix_thumbnail_override.ps1

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+# Fix OneDrive Thumbnail Override - Restore Local Thumbnails
+# This script disables OneDrive's cloud thumbnail providers that override custom thumbnails
+
+Write-Host "🎯 Fixing OneDrive Thumbnail Override Issue..." -ForegroundColor Cyan
+Write-Host "This will restore priority to your locally-generated thumbnails." -ForegroundColor Yellow
+
+# Check if running as administrator
+if (-NOT ([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole] "Administrator")) {
+    Write-Host "❌ This script requires administrator privileges. Please run as administrator." -ForegroundColor Red
+    exit 1
+}
+
+# 1. Disable OneDrive Files On-Demand thumbnail override
+Write-Host "🔧 Disabling OneDrive Files On-Demand thumbnail override..." -ForegroundColor Green
+
+try {
+    # User-level OneDrive policies
+    if (!(Test-Path "HKCU:\SOFTWARE\Policies\Microsoft\OneDrive")) {
+        New-Item -Path "HKCU:\SOFTWARE\Policies\Microsoft\OneDrive" -Force | Out-Null
+    }
+    Set-ItemProperty -Path "HKCU:\SOFTWARE\Policies\Microsoft\OneDrive" -Name "DisableCloudThumbnails" -Value 1 -Type DWord
+
+    # Machine-level OneDrive policies
+    if (!(Test-Path "HKLM:\SOFTWARE\Policies\Microsoft\OneDrive")) {
+        New-Item -Path "HKLM:\SOFTWARE\Policies\Microsoft\OneDrive" -Force | Out-Null
+    }
+    Set-ItemProperty -Path "HKLM:\SOFTWARE\Policies\Microsoft\OneDrive" -Name "DisableCloudThumbnails" -Value 1 -Type DWord
+
+    Write-Host "✅ OneDrive thumbnail override disabled" -ForegroundColor Green
+} catch {
+    Write-Host "⚠️ Warning: Could not set OneDrive policies: $($_.Exception.Message)" -ForegroundColor Yellow
+}
+
+# 2. Disable cloud files thumbnail provider
+Write-Host "🔧 Disabling cloud files thumbnail provider..." -ForegroundColor Green
+
+try {
+    # This is the key provider that overrides local thumbnails
+    $cloudProviderPath = "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\ThumbnailProviders\{E357FCCD-A995-4576-B01F-234630154E96}"
+    if (Test-Path $cloudProviderPath) {
+        Remove-Item -Path $cloudProviderPath -Force -Recurse
+        Write-Host "✅ Cloud thumbnail provider removed" -ForegroundColor Green
+    } else {
+        Write-Host "ℹ️ Cloud thumbnail provider not found (may already be disabled)" -ForegroundColor Blue
+    }
+} catch {
+    Write-Host "⚠️ Warning: Could not remove cloud thumbnail provider: $($_.Exception.Message)" -ForegroundColor Yellow
+}
+
+# 3. Set local thumbnail preferences
+Write-Host "🔧 Configuring local thumbnail preferences..." -ForegroundColor Green
+
+try {
+    # Ensure local thumbnails are enabled
+    if (!(Test-Path "HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced")) {
+        New-Item -Path "HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced" -Force | Out-Null
+    }
+    
+    Set-ItemProperty -Path "HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced" -Name "IconsOnly" -Value 0 -Type DWord
+    Set-ItemProperty -Path "HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced" -Name "DisableThumbnailsOnNetworkFolders" -Value 0 -Type DWord
+    
+    # Add custom registry value to prefer local thumbnails
+    Set-ItemProperty -Path "HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced" -Name "UseLocalThumbnailProvider" -Value 1 -Type DWord
+
+    Write-Host "✅ Local thumbnail preferences configured" -ForegroundColor Green
+} catch {
+    Write-Host "⚠️ Warning: Could not set local thumbnail preferences: $($_.Exception.Message)" -ForegroundColor Yellow
+}
+
+# 4. Disable OneDrive shell icon overlays (these can interfere with thumbnails)
+Write-Host "🔧 Disabling OneDrive shell overlays..." -ForegroundColor Green
+
+$overlayPaths = @(
+    "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\ShellIconOverlayIdentifiers\OneDrive1",
+    "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\ShellIconOverlayIdentifiers\OneDrive2",
+    "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\ShellIconOverlayIdentifiers\OneDrive3",
+    "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\ShellIconOverlayIdentifiers\OneDrive4",
+    "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\ShellIconOverlayIdentifiers\OneDrive5",
+    "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\ShellIconOverlayIdentifiers\OneDrive6",
+    "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\ShellIconOverlayIdentifiers\OneDrive7"
+)
+
+$overlaysRemoved = 0
+foreach ($overlayPath in $overlayPaths) {
+    try {
+        if (Test-Path $overlayPath) {
+            Remove-Item -Path $overlayPath -Force -Recurse
+            $overlaysRemoved++
+        }
+    } catch {
+        Write-Host "⚠️ Warning: Could not remove overlay $overlayPath" -ForegroundColor Yellow
+    }
+}
+
+Write-Host "✅ Removed $overlaysRemoved OneDrive shell overlays" -ForegroundColor Green
+
+# 5. Clear thumbnail cache to force regeneration
+Write-Host "🔧 Clearing thumbnail cache to force regeneration..." -ForegroundColor Green
+
+try {
+    # Stop Explorer process
+    Stop-Process -Name "explorer" -Force -ErrorAction SilentlyContinue
+    Start-Sleep -Seconds 2
+
+    # Clear thumbnail cache
+    $thumbCachePath = "$env:LOCALAPPDATA\Microsoft\Windows\Explorer"
+    $thumbCacheFiles = Get-ChildItem -Path $thumbCachePath -Filter "thumbcache_*.db" -ErrorAction SilentlyContinue
+    
+    foreach ($file in $thumbCacheFiles) {
+        try {
+            Remove-Item -Path $file.FullName -Force
+        } catch {
+            Write-Host "⚠️ Could not remove $($file.Name)" -ForegroundColor Yellow
+        }
+    }
+
+    # Restart Explorer
+    Start-Process -FilePath "explorer.exe"
+    Start-Sleep -Seconds 3
+
+    Write-Host "✅ Thumbnail cache cleared and Explorer restarted" -ForegroundColor Green
+} catch {
+    Write-Host "⚠️ Warning: Issues clearing thumbnail cache: $($_.Exception.Message)" -ForegroundColor Yellow
+    Write-Host "🔄 Please restart Windows Explorer manually" -ForegroundColor Blue
+}
+
+# 6. Prevent automatic thumbnail cache deletion
+Write-Host "🔧 Preventing Windows from auto-deleting thumbnail cache..." -ForegroundColor Green
+
+try {
+    # Disable thumbnail cache auto-cleanup in Disk Cleanup
+    $autorunKey = "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\VolumeCaches\Thumbnail Cache"
+    if (Test-Path $autorunKey) {
+        Set-ItemProperty -Path $autorunKey -Name "Autorun" -Value 0 -Type DWord
+    }
+
+    # Also disable for WOW64 on 64-bit systems
+    $autorunKeyWow64 = "HKLM:\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Explorer\VolumeCaches\Thumbnail Cache"
+    if (Test-Path $autorunKeyWow64) {
+        Set-ItemProperty -Path $autorunKeyWow64 -Name "Autorun" -Value 0 -Type DWord
+    }
+
+    Write-Host "✅ Thumbnail cache auto-deletion disabled" -ForegroundColor Green
+} catch {
+    Write-Host "⚠️ Warning: Could not disable thumbnail cache auto-deletion: $($_.Exception.Message)" -ForegroundColor Yellow
+}
+
+Write-Host ""
+Write-Host "🎉 OneDrive thumbnail override fix complete!" -ForegroundColor Green
+Write-Host ""
+Write-Host "📋 What was changed:" -ForegroundColor Cyan
+Write-Host "   ✓ Disabled OneDrive cloud thumbnail providers" -ForegroundColor White
+Write-Host "   ✓ Removed cloud files thumbnail provider" -ForegroundColor White
+Write-Host "   ✓ Set local thumbnail preferences" -ForegroundColor White
+Write-Host "   ✓ Disabled OneDrive shell overlays" -ForegroundColor White
+Write-Host "   ✓ Cleared and regenerated thumbnail cache" -ForegroundColor White
+Write-Host "   ✓ Prevented automatic thumbnail cache deletion" -ForegroundColor White
+Write-Host ""
+Write-Host "🔄 Please restart your computer for all changes to take effect." -ForegroundColor Yellow
+Write-Host "📁 Your custom thumbnails should now have priority over OneDrive's generic icons!" -ForegroundColor Green