I know most of the customizer’s, developers will be aware of this small utility but those how don’t know about this will get to know after reading this post!
So what it is?
OldNewExplorer is the Windows 8.1 and Windows 8shell extension / tweaker which can undo “improvements” to file browsing made in newer Windows version.
This small utility will help you to enable Preview pane, help to disable ribbon,Hide Up arrow and much more..
Simply, this will help you to make your windows 8/8.1 look more like windows 7.
Also unlike other patch’s this will not break the boot, this is a guarantee that this will work flawlessly.
Some more developer’s note:
– Restore devices / drives grouping
Everything is ‘Devices and drives’. That’s stupid! O-N-E can restore grouping which made sense in Win7/8.
– Restore libraries / remove folders
Remove all those folders which were unoptionally added into Windows 8.1 This PC folder and put the libraries back to their place, without registry hacking / breaking 
apps.
– Restore command bar / remove Ribbon
Because some people consider it an abomination.
– Restore details pane at bottom
Same reason; reclaim useful horizontal space.
– Improve styling
Get rid of some Win7 stuff here and there; improve styling with some built-in visual styles.
For themers / skinners, O-N-E can help to override a lot of hardcoded styling in Windows 8, maybe even Start screen!
This utility will also help windows theme developers to add themeable control panel images and side panel images, geniune image and shellbrd orb in their .msstyles!
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