Enable more than one Normal Map type: coding in setting.cfg?

[LoopZoop]

So under the options for normal maps, the file type specified is set for

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normal map pattern = _n

Now, I have installed files in the past where the format was

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_nm

Is there a way to add this file type to the above options? As an additional file type?

I have basically no coding experience, but am somewhat familiar at the most basic level of it, and I looked up what I thought could be (again, zero practical skill), but could something like thishttp://www.ats.ucla.edu/stat/sas/faq/mu ... e_read.htm work?

Thanks