Hi,
These files are necessary for a Windows installation. Most of them are helper applications that Microsoft uses to complete any Application Installation.
-Distrib.cab - as you already know is a Cabinet file. This is a Windows Installer archive file, which contains data for the installation.
-DKTemplateEN.msi - this is also a Windows Installer file that holds installation control level information
-InstMsi.exe/InstMsiW.exe - This is a distributal executable from Microsoft that installs the Windows Installer Application. InstMsiW.exe is used for Win2000/NT 4.0
-Setup.exe - Runs the Installation application
-Setup.ini - Is a text file that contains any additional configuration information for Setup.exe.
*MSDN has a page dedicated to installation information here:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/msi/setup/about_windows_installer.asp
*A great resource I use for finding information about a file type is FilExt. It contains information about most well known file extensions, including external links with descriptions of file types. You can get to the FilExt website here:
http://www.filext.com/
Regards,
Tyler T.