As mentioned, it's not possible to open .hbk files on the PC. What you can do is:
- Restore the .hbk to your phone as SMS
- In your SD card, make sure you have a folder called sms_backup. If this doesn't exist, create it. This will be in the same level as the Android folder.
- Copy the .hbk file to the sms_backup folder
- Restore the SMS from the SMS settings
- Export the SMS as .xml using SMS Backup & Restore
- Email the .xml file to your PC
- After downloading the .xml file, open it from a program like Notepad or Microsoft word, and print.
Take note that XML has a weird structure, so expect to see a lot of tags (in greater than and less than signs).