Open - Touch & rotate CCW thumb & three fingers
Close - Touch & rotate CW thumb & three fingers
Save - Touch & contract thumb & three fingers. Combine with Shift for Save As... in some apps.
New - Touch & expand thumb & three inner fingers
Print - Pre-spread your hand, then touch & further expand thumb & three outer fingers
Next File - Touch and slide thumb & three fingertips to the left (only works in some editors).
Prev File - Touch and slide thumb & three fingertips to the right (only works in some editors).