One rarely need to run a Windows-only app on Power Mac G5, but if he wants here is an interesting option. OpenOSX's web page for WinTel 1.0.1 reads as follows:
"Experience full compatibility with Pentium(R) processors, disk image and CD-ROM support. Floppy disk support may be achieved by creating a disk image with Apple's Disk Copy software. Use the Finder to transfer data between the emulator and the Mac OS X operating system."
Fully-compatible and optimized for the new PowerMac G5, with more optimizations under development.
WinTel/Bochs was successfully tested with Windows 95, Windows 98, Windows 2K, Windows NT 4.0 and Windows XP Professional. Thanks to Mac OS X's advanced architecture, multiple G4 CPUs can be utilized and are emulated as a single powerful Pentium(R) processor or as dual Pentium Processors. Mac OS X is a true chameleon of operating systems, users may now run a long list of operating systems within it: Mac OS 9, Windows 95/98/2K/NT, DOS, Linux, Unix, BSD, etc. software, seamlessly.
