I know why you need to know that. many users who perform an accidental drag/drop on a folder rather than a solid double click to view the contents of the folder.
I find that folders will go missing, only to find it has been moved to a nearby folder by mistake.
you can try TweakUI to adjust the limit (in pixels) to adjust how sensitive the mouse is to drag and drops from the standard value of 4 to a maximum of 32.
But if you change that value in the registry instead you can set a much higher value, one that exceeds the screen resolution and therefore makes it impossible to move the mouse enough away from an object. That way Windows never notice it's supposed to drag the object away along with the mouse pointer.
Making a simple reg-file containing this solves the problem:
REGEDIT4
[HKEY_CURRENT_USER\Control Panel\Desktop]
"DragHeight"="999999"
"DragWidth"="999999"
Restart the computer for the change to have effect.
Resetting these values to 4 sets it all back to default again.
