Do you still need Publisher 98 installed?
I recommend removing Publisher 98 and restoring your copy of 2010.
If you wish to keep both installed, you can open with Publisher 2010.
To do so:
right-click the file while holding down the shift key
Click Open With and Choose program
If 2010 is not listed, click on the browse button and navigate to 2010's executable.
You can then set it to always open with 2010.