Change the size of Thumbnail Preview. Aero Peek

Make the Taskbar Thumbnail Preview Bigger in Windows 7

Source: http://www.winhelponline.com/blog/increase-taskbar-thumbnail-preview-size-windows-7/

1. Launch Regedit.exe and navigate to the following location:

HKEY_CURRENT_USER \ Software \ Microsoft \ Windows \ CurrentVersion \ Explorer \ Taskband

2. Create a DWORD value named MinThumbSizePx

3. Double-click MinThumbSizePx and set its value data accordingly. I set it to 350 (Decimal) for this example.

4. Exit the Registry Editor.

5. Logoff and login back.

And you can see below that the taskbar thumbnails has grown bigger in size.

Additional Information

Similarly, you can tweak the following registry values under the "Taskband" registry branch, and customize the taskbar thumbnail previews as you need. Here is the entire list:

1. NumThumbnails
2. MinThumbSizePx
3. MaxThumbSizePx
4. TextHeightPx
5. TopMarginPx
6. LeftMarginPx
7. RightMarginPx
8. BottomMarginPx
9. ThumbSpacingXPx
10. ThumbSpacingYPx