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The goal: Windows 7 always creates a folder cache file called thumbs.db in order to cache thumbnails. This behaviour might be unwanted especially on network drives. The following registry key disables the creation of thumbnail cache files:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\DisableThumbnailCache=1
In addition you can download this file, change it's extension to .REG and double-click on it to automatically insert the value into your registry:
Disable thumb.db files on network drives in Windows 7 - REG File