I meant that you should right-click on a *.bmp file (which you find using Windows Explorer), not right-click on it after you have already opened it with PhotoPaint.
Whether you go to Default Programs > Associate a file type or protocol with a specific program > Change program
or right-click on a *.bmp file and select Open with, you end up at the same place -- the "Open with" dialog.
In the "Open with" dialog, you click the "Browse" button and then start exploring in Corel Suite 13 > Photo Paint.
At this point, you need to determine which of the files is PhotoPaint itself. I don't have PhotoPaint installed, so I can't tell you the exact name of the file to look for (it's probably "Corel PhotoPaint.exe"), but here's one way to find out.
If you have a shortcut on your Desktop to start PhotoPaint, right-click that shortcut and select "Properties." If you don't have a shortcut on your Desktop, click the Start Orb, scroll until you find Corel PhotoPaint, right-click on it and select "Properties."
The "Shortcut" tab should already be selected (if it's not, select it).
Look at the "Target" and if necessary, use the mouse or the right arrow key to make sure that you're looking at the right end of the line. The program after the last \ character is the file you need to look for and "Open" when you're browsing in Program files.
Here's an example for Corel PaintShop Pro X8, which in this example is in
C:\Program Files (x86)\Corel\Corel PaintShop Pro X8