Creating a file of any size in dos..?

[Wat]

I remember a dos command that could create a file of any size. For example i could type:
command dummyfile.txt 200000
which would create a dummyfile.txt and was 200 kb. I have tried to find the command with no luck, anyone have any idea? Thank!

[Wat]

That took entirely too long, I spent atleast 30 minutes on google.

fsutil file createnew d:\temp\1mbfile.txt 1048576

That will create a new file of 1mb. Thanks anyways