Pass File Size To Button?

This should work with Everything:

@evalalways:=type = KeyDown("ctrl") ? "folder:" : KeyDown("shift") ? "file:" : "";
LogicRun IN {sourcepath$} GETPROPS USEEVERYTHING {=type + "size:$(sizeautoEV)$ "=}
[[
COMMANDS
Select FROMSCRIPT DESELECTNOMATCH
]]

Edited for better performance.

Not sure. IMHO Windows Search is garbage, so I never use it.