I figured out how to get them the way I like them. Start by editing the saved RDP file with a text editor that won't mess up the character encoding. (probably not Notepad or Wordpad.) Edit the 'winposstr' string. It looks like this:
winposstr:s:0,1,10,10,1708,1105
The values are
winposstr:s:0,windowState,xLeft,yTop,xRight,yBottom
I found that for a 1680x1050 window, I need to add 18 pixels to the width and 45 pixels to the height in Windows 7 to account for the borders. Then, you do the math for (x,y)+(width,height) to figure out the start position of the window and the right,bottom corner.
windowsState can be changed to control the initial maximized state of the window:
- 1 - normal
- 2 - unknown
- 3 - maximized
That's it.