For those who don't know, there are several executable formats where smaller programs can be written. For instance, a .COM executable (a legacy format now [2]) can be written in just 20 bytes [1].
In the case of the Portable Executable (PE) format, 97 bytes is certainly an impressive feat.
[1]: http://www.gnostice.com/nl_article.asp?id=225&t=The_Smallest...