When you are dealing with a folder in Microsoft Windows containing numerous images, it is often very helpful to see thumbnail representations of those images in the Windows Explorer display. This built-in functionality is available in both Windows XP and Windows Vista, but how you turn the feature off and on is slightly different for each version.
One caveat for the resource-sensitive: turning on the thumbnail feature will increase the amount of resources being used by the operating system. Those little thumbnails take up space on the hard drive and in memory when they are being displayed. Depending on your system, the available resources, and the number of images involved, you can quickly bog down your PC if you are not careful. This is why many users will be interested in this tip for the opposite reason — they want to know how to turn off thumbnail creation in Windows.
Windows XPOpen Windows Explorer and navigate to the folder of images for which you would like to see thumbnails. On the Windows Explorer menu, click Tools | Folder Options to get to the Control Panel. Click the View tab, as shown in Figure A.
XP Folder Options - View
Under the Files And Folders section, you will see the Do Not Cache Thumbnails check box. If this box is checked, there will be no thumbnails cached on your hard drive. So if you want thumbnails, you will want to uncheck it. Click OK after you've made your selection.To start seeing thumbnails, you have to change views in Windows Explorer. On the menu bar, click View | Thumbnails, and Windows will replace the normal file icons with thumbnails of the images. Windows will also create a new file in that folder called Thumbs.db, where the thumbnail information is stored, as shown in Figure B.
Thumbnails - XP
The Thumbs.db file will be created in every folder you designate to display thumbnails. To apply your changes to all Windows Explorer folders, navigate to Tools | Folder Options and click the View tab. From there, make your changes and then click the Apply To All Folders button before you click OK.
Windows VistaTurning on the thumbnail feature is slightly different in Windows Vista. Open Windows Explorer and navigate to the images folder where you would like to see thumbnails displayed. On the menu, click the Organize tab and then Folder And Search Options. On the ensuing control applet, click the View tab, as shown in Figure C.
Vista Folder Options - View
Under Files And Folders, uncheck the Always Show Icons, Never Thumbnails check box. That will turn on thumbnails for that particular folder. If you want to apply the change to all folders, you should click the Apply To Folders button. Click OK to finish the process.
Thumbnails - VistaWindows Vista has an additional way to view thumbnails in Windows Explorer. Click Organize | Layout and choose to add the Preview Pane. That selection will add an area to the right of the display where a larger thumbnail of each image will be displayed as you highlight it, as shown in Figure E.
Preview Pane - Vista
Once again remember the caveat: thumbnails take up resources. Be careful how you use them. And if there comes a time when you want to turn them off, just do the opposite of the procedures described here. In Windows XP, you would also want to delete the Thumb.db file in each folder.
Mark W. Kaelin has been writing and editing stories about the IT industry, gadgets, finance, accounting, and tech-life for more than 25 years. Most recently, he has been a regular contributor to BreakingModern.com, aNewDomain.net, and TechRepublic.