Yes. You need another piece of software though.
Use Pronto Edit 4 (
www.prontoedit.com) to create a CCF file from the hex codes. Then, use the Universal Browser to import the CCF.
To create the CCF, open Pronto Edit and choose a TSU1000, for the sake of easiness. Click the green "add panel" button on the toolbar, then double click a button. Click "Set IR" the "View IR >>". In the white box that appears, paste the hex code, then click "OK". Under the properties tab, you can label the button. Repeat as desired for other buttons. Then do a file-save as and save the CCF. Go into the MX-3000 software and find the universal browser, and use it to open the CCF file.