You may have already found your answer, but I am trying to the same thing, without requiring any additional software tools.
Here's my planned approach:
- First step - get the correct aspect ratio. The promo jpg's are 994x262 (W x H), so the ratio is 3.7938 : 1.
- Open the original picture with "Microsoft Picture Manager".
- Look at the width of the original image. If it is (for example) 1600, you want the height to be 1600/3.7928, which is 421.7 pixels. (If the original is 1024 width, you need 270 height...etc...)
- click on edit, then crop.
- move the handles vertically to get (about) 421 pixels height.
- next use "re-size" to set the specific dimensions you need (994x262) then "save as" using a new file name.
- exit Picture Manager (but don't save - this would modify your original image file).
I am just going to upload my re-sized files to try this on my site. Will post again with the results.