Why don't the Resize Pictures dialog appear while sending picture to e-mail?

Why don't the Resize Pictures dialog appear while sending picture to e-mail?

When you select an image file and click "E-mail this file" in the Common Tasks pane, the image resize dialog may not appear.

This happens if the image file is not a natively supported type by Windows XP. The supported file types are the following:
BMP DIB EMF GIF JFIF JPG JPE JPEG PNG TIF TIFF WMF


If the file type is a natively supported image file type, and still the dialog does not appear, follow these steps:
1. Click Start, Run and type regsvr32 shimgvw.dll
2. Restart Windows for the changes to take effect