I ran this in Windows 7, but using fsutil you have a LOT of options.
fsutil file createnew c:\testfile.txt 150000000
this created a 150mb empty file so I can use for testing. If you run fsutil you will see you have a lot more options:
8dot3name 8dot3name managment
behavior Control file system behavior
dirty Manage volume dirty bit
file File specific commands
fsinfo File system information
hardlink Hardlink management
objectid Object ID management
quota Quota management
repair Self healing management
reparsepoint Reparse point management
resource Transactional Resource Manager management
sparse Sparse file control
transaction Transaction management
usn USN management
volume Volume management