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Microsoft Resource Kits - Windows 2003 Resource Kit

Creatfil.exe  (Windows 2003 Resource Kit)

The Window Server 2003 Resource Kit is a set of tools that system administrators and engineers use to manage or support a Windows Server 2003 system. Use it to streamline management tasks such as troubleshooting operating system issues, managing Active Directory, configuring networking and security features, and automating application deployment.
Creatfil.exe - Create File
This command-line tool creates an artificial file of any size. This is useful for testing the behavior of tools, applications, and setup programs under conditions of low available memory on a hard disk. Create File must be run from the command prompt; it cannot be run from the Run command on the Start menu.
Switches:
Path - Specifies the directory where the file will be created.
FileName - Specifies the name of the file that will be created.
FileSize - Specifies the size of the file in 1KB increments.