AutoCad :: Change Global Text Font

Basically, we get documents from other people and we convert those to our formats to do our work. We use a font called Simplex, but sometimes their document is filled with, like, Comic Sans or something stupid.

The match properties command doesn't seem to change font, just size and alignment. When I use the font properties dialog box, I can set simplex as the font, but when I make new text, it still matches their comic sans.

So two questions: How do I change the default font for the document so that all new text is the way I want it?

And is there a LISP routine which will find all text and change the font property and stuff the way I want it? For multi-line and single line text.

Also note, I've tried selecting all the text and editing properties, but font is not one of the properties I can change. To change font, I have to edit every piece of text one by one. And then ONLY multiline text has the properties to change font. I don't even know how to change the font of a single line text object.