InstallAware

I've got a client installing my application and he tells me that after the system reboots, before it gets to the desktop, he gets a message to insert the WinWMF disk. I'm trying to find out what program requirements it was addressing when it rebooted but in the mean time I was wondering if anybody knows what this is about.

The requirements for my applications are:

• .NET Framework 2.0
  .NET Framework 2.0 with SP2
  .NET Framework 3.0
  .NET Framework 3.0 SP2
  .NET Framework 3.5 with SP1
  DirectX 9b
  Internet Explorer 6 with SP1
  MDAC refresh 2.8 with SP1
  SQL Express 2008 with SP1
  Windows Installer 4.5
  Windows Parser 6.0

So does anybody know what the WinWMF is, who needs it and why it would be looking for a disk?
Looking at this list causes me to wonder if I should remove the .NET Framework 2.0 requirement since the .NET Framework with SP2 is listed.
Your comments and suggestions are appreciated.