script: Fix path in SetVersion.ps1
FileSize: Use 1000 as base, not 1024

I, as many others, are often confused how many bytes are in kilobyte
or megabyte. 1024 has mistakenly been widely used, but is not correct.
1024 base units have their own names, kibibyte, mebibyte, gibibyte etc.

Source:
http://en.wikipedia.org/wiki/Units_of_information