BankLink client files have the format .BK5, and to open these files you need to run the setup file bkhandlrsetup.exe. This is done to ensure Windows knows to open .BK5 files with BankLink Practice.
Help at your fingertips
Press F1 in BankLink Practice for more information on this topic - then navigate to Chapter A1: Setting up MYOB BankLink Practice and MYOB BankLink Notes: Enabling. Then you will need to double click on Import and Update on users' workstations.