This application doesn't appear to be available anymore. I've checked various websites and it appears that ProBusiness Payroll is a discontinued software. Typically, you can check the supported file formats all by yourself through the File > Import menu. Or you could look in the Help section. Many functions of the software as well as supported file formats are mentioned there. If the Help section doesn't provide necessary information, go to the installation directory and look for PDF or HLP/CHM files.