Lets see if I can get the three plans of the Side Pocket 20 in one post

Right click of the word "Attachment.txt" then select "Save target as", next select a folder on your harddrive to save the file to,

Then type
sidepocket20-1.tif, for the first,
sidepocket20-2.tif, for the second,
and
sidepocket20-3.tif, for the third

in filename textbox. You should now have 400 DPI scans of the 20 size plans.
You can use whatever name you want but it must end in .tif (that's a "period" or ".", followed by the letters "tif"