To be able to open a file with more than one program, follow these
instructions: 
the File Types tab
Actions. This is where Windows 98 stores the actions to be taken when
you double click on a file, drag it to a printer, and so on. You can have more
than one Open, so long as each action is a unique character string. For
example, you could edit the Gif file type registration so that you have one
entry named Open and another named Open (Paint Shop Pro). For each entry edit
the actions needed to open the file with the appropriate application
dialog box, type the name of the action in the Action box
perform action
will be the application used when you double click on a file of that type. If,
however, you right click the file, all of the entries you placed into the
Actions box will appear on the context menu making it easy to open the file
with the application of your choice
Multiple File Registrations