difference between UNIX and WIN source package

["Syntax" <aries.syntax.cch@xxxxxxxxx>]

On the download page , we can see below:

 

Unix Source: httpd-2.2.3.tar.gz [PGP] [MD5]

Unix Source: httpd-2.2.3.tar.bz2 [PGP] [MD5]

Win32 Source: httpd-2.2.3-win32-src.zip [PGP] [MD5]

Win32 Binary (MSI Installer): apache_2.2.3-win32-x86-no_ssl.msi [PGP] [MD5]

 

My question is :

 

Is there any one know about what is the difference between UNIX source and WIN source in detail ?

 

(Of course, we all know UNIX source is for unix-like platform and WIN is for WIndows.)

I want to know why it has to be distributed into those two platform package, what's different, detail, in program code or something ...

 

Any one can answer ? or any where the documents about it is ?

 

 

Thanks for your help.