Lister file icons

I use Foxit Reader to view PDF files.

When browsing file listings in DOpus, PDF files with upper case extensions display the Foxit icon. Files with lower case extensions display the general file icon. How can I get file lists to display Foxit icon for lower case extensions?
Other file extensions to not appear to be a problem.

Any suggestions would be appreciated

Does the same thing happen in Explorer?

I too use Foxit for reading pdf files and don't have the same problem.

See the screen shot. The O/S is Windows Vista, haven't tried it in XP.