This is an update to:
You can download the actual installer from: http://nkcorner.com/gvim73.exe (64 bit only, includes all patches up to and including 7.3.003).
To create the 7.3 version, you must download:
There are no extra or lang archives. Everything is included in the main archive.
Download the 7.3 patches:
Follow all of the previous instructions (except for what relates to extra and lang archives).
Also modify the gvim.nsi file to change all instances of gvimext64.dll to gvimext.dll.
Other than that, it is all the same.