DXF and EPLAN?

I'm a technical translator and I'm working with a colleague to
translate some CAD drawings into German. Our client has EPLAN
(www.eplan.de) and they exported the drawings into DVX format for us
to work with using AutoCAD (I have both AutoCAD LT 2000 and AutoCAD LT
2005).

The first sign that something was strange, was that the phrase mm² in
the drawing (should be mm with a superscript 2, meaning "square
millimeters") was displayed in AutoCAD as "mmý" (mm, followed by y
with an acute accent ´).

In addition, AutoCAD reported that the Standard text style used a font
called Monotxt8.shx, which did not appear on my computer. We asked
the client for it, and they had no idea what we were talking about.

Personally, I think that the EPLAN export routine must have inserted
the reference to Monotxt8.shx. Does anyone have another idea?

I converted the mmý to mm2 (no subscript) and we started the
translations. When we sent the first few DXF files back to the
customer, they noticed another problem problem. The German characters
with Umlauts (for example, ä) are displayed as other non-German
characters (such as Greek epsilon)

The client says that they have another employee with more experience
with EPLAN should be able to take a look at this and find a solution,
in order to display the German characters properly. However, until
that happens, I'm trying to learn as much as I can.

We contacted the EPLAN office in the USA and they suggested that we
export the DXF file from AutoCAD while specifying a Unicode font. I
can't tell which fonts in AutoCAD LT 2000 or 2005 are Unicode. Can
someone tell me whether this advice makes sense?

If they can figure out how to generate the German letters in EPLAN,
one solution might be for my colleague to go to their office and
insert the German characters in the EPLAN drawings. But that will
take a long time.

What makes more sense would be for the client to find a way to import
our DXF files without further modification.

Does anyone have any experience importing DXF files and/or working
with fonts in EPLAN?