What are the tar.gz files for Windows Java JRE (7, 8)?

From what I can tell from the tests I've done over the last hour, Oracle has finally (*) included "xcopy style" packages for the Java JRE on Windows - even for the serverless version.

And yes, I know what a gzipped tar file is. It's just that there is no documentation for these files - compared to the executable installer for Windows it is documented.

Looking at the current Java 7 or 8 download pages for a non-server JRE I see:

• Windows x86 Online jre-7u67-windows-i586-iftw.exe
• Windows x86 Offline jre-7u67-windows-i586.exe
• Windows x86 jre-7u67-windows-i586.tar.gz
  
  
• Windows x64 jre-7u67-windows-x64.exe
• Windows x64 jre-7u67-windows-x64.tar.gz

These zipped files don't seem to be mentioned in any docs I could google, but their purpose doesn't seem to be to run any installer, just copy them over to the machine, set the path (s) correctly , and run them. (and run it, i checked this).

However, no mentions or documents seem strange at all. So, is there any official mention of introducing these files tar.gz

for Windows? As far as I can tell from the historical downloads , they were introduced in J7u9 - and for Java 8, apparently since 8u20.

_{(*) "finally" relative ... J7u9 is from 2012-10-16, so this is really not the last, but I'm just now starting to explore the possibility of running J6 on J7 / J8, so it's nice to see them now.}