Thumbnail & Icon Cache
Windows Explorer stores thumbnail and icon metadata in disk-backed cache databases under %LocalAppData%\Microsoft\Windows\Explorer so folders, Start menu entries, and file listings can render previews without regenerating them every time. These files include thumbcache_*.db thumbnail databases and iconcache_*.db icon databases that hold cached image previews, shell icons, and size-specific variants built from files, shortcuts, and application resources. Kudu removes these stale thumbnail and icon cache databases so Explorer can rebuild fresh previews and icons without affecting your files, user accounts, saved settings, or passwords.
Why clean Thumbnail & Icon Cache?
- Stale thumbcache entries keep showing old previews after a file was replaced or edited, so photos, videos, and documents display the wrong thumbnail in Explorer
- Corrupted iconcache databases cause blank white icons, generic file icons, or mismatched app icons in folders, on the desktop, and in the taskbar
- Explorer can become sluggish when cache databases contain invalid records, with noticeable delays while opening large folders full of media files
- Removed or updated applications may leave orphaned icon mappings behind, so shortcuts continue showing the previous icon until the cache is rebuilt
- Thumbnail databases can grow large after browsing many image and video folders, wasting disk space while still serving outdated previews
- After graphics shell components or file associations change, cached preview data may no longer match current handlers, leading to missing thumbnails or inconsistent preview sizes
- The cache databases are ESE-like binary stores that can accumulate fragmentation and stale pages over time; rebuilding them rewrites clean databases rather than touching your actual files
Cache paths Kudu targets
Windows
%LocalAppData%/Microsoft/Windows/Explorer |
Common questions about Thumbnail & Icon Cache
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Available on Windows, macOS, and Linux. No account required, no feature gates, no telemetry without consent. All cleaning targets are open source and community-auditable.