http://wiki.blender.org/index.php/Dev:Ref/Release_Notes/2.75/UI
https://developer.blender.org/rB054aa61f3c9af0
Can you direct me or post a screen how does this feature should looks like in UI?
How can I change size of previews in file browser?
Under OS X I don’t see it.
Thank you.
Seems the slider for this was boiled down to a drop-down menu:
OK, thank you for screen 
Maybe it was a reason to use drop-down menu.
In a previous build (I used) were suppose to be a resize slider was nothing to change size thumbnail.
Now I see drop-down menu in RC. I was too concentrated to find slider or shortcut to resize like “Ctrl+Alt” that resize panels, that I ignored this menu Thank you for your time.
Thanks for notifying, the wiki was a bit out to date (should be fine now).
Hi
Here is the sneake peek 22
Cheers
Tai