Hi. I have a G-Code file which I want to alter the Z approach feed speed from the clearance height of Z20.
There are about 200 of these approaches and I'm looking for an easy way to alter the code.
The code I have is similar to this.

G01 Z3 F50
G01 Z0 F1200

And would like to alter to this.

G00 Z3 (G01 altered to G00 and F50 dropped to next line)
F50
G01 Z0 (F1200 dropped to next line)
F1200

Is there any Text Editor Programs that will do this or will I need to write a text macro?
Thanks.