What is the ideal file format to a simple text button?

Helvetica. Nice, clean, simple font.

import it into your computer and then convert it to acc format. its quite simple

First you select the photo or picture what you want in JPEG format, then copy into paint program then go to click the save as option, the box shown in .bmp format, you have select JPEG format to save. It is very simple to use.

Thank you

In open office they have templates to use for formatting a simple letter.