You can use DATA MERGE, name the field with an @ symbol, like @equation-file.
I would strongly recommend to avoid EPS, but with equation text no damage is to be expected with using EPS, so in this case it is possible.
As I see, you're not a specialist of maths equations treatment.
What you propose will generate a baseline adjustment great problem.
So, what Brian needs to use is a plugin named MTScript. Does not work on OSX, only Windows. But does exactly what he needs.
The problem depends only if wrong object styles are used, if the object style for the equation is correct, no problem with the baseline adjustment will appear.
Hmmm, let me look into this. In my case, I absolutely need EPS since I am doing some special things to it via scripting.
The other issue is that I am on Windows, but the designer working on the full project is on Mac.
It is not a matter of object style. The big difference between MathType and MathMagic is the managing of the baseline. It's the reason I prefer use MathMagic.
With these two plugins, there's no object style associated [None]. The definition of the baseline is "integrated" in the equation .eps file itself.
If you've never done equations, it is normal that you do not know this kind of thing!
I looked at MathMagic and I had issues with it. MathType is "dumber", but in my case it is more flexible and I can do some Greek symbol adjustments (neither program is good at that) via custom Perl script. Anyway, that gives me a final EPS. Actually, I don't have a problem with baseline shift of EPS files (a native import of the equation does cause problems though but it is a moot point).
Exactly how does this Data Merge work? I poked around it seemed confusing. I will have the designer look into it as well. Perhaps he is more familiar.
When you go to Window > Utilities > Data Merge you will get the panel. There is a simple description how to handle it.
As a Mechanical Engineer and Master of Business Administration of the University of Linz and an InDesign Professional I know how to handle equations in InDesign.
I don't understand well your problem.
As I understand, apparently, the beginning is a word file. You export all the MathType equations (.eps folder) and replace them by <<Eqn....eps>> using MathType features.
So why don't you use MTScript: it'll replace all <<Eqn....eps>> by the corresponding .eps file in the ID file that you can finally open with ID on Mac?
Well, the problem is that I really don't want to be doing this work (I just want to develop efficient processes to make it easier on the designer - and hence reduce my bill). That said, I can probably do this first step and give the designer a package with the ID file and EPS files. I will give MTScript a shot since it seems like it may work.