You are correct lambsqtrs.
I just tried to open a translation I pulled from a 91O over the weekend.

And I get the following:
This system translation file is not supported by this application. Only Partner ACS R3.0/R4.0/R5.0/R6.0API for R.6/R7.0 translation files are supported.

So it has to be something with the 91O. frown

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