Your link is broken.

It doesn't really look like a text file. Keep searching.

You should try reimport mode in quickbms with this script
https://aluigi.altervista.org/bms/gundam_memories.bms

Yeah, sure, but you could just... google it, you know? When you type "UnityEx download" in google, you'll get some results. Anyway, here are some links: https://grajpopolsku.pl/forum/download/file.php?id=4128 https://mega.nz/file/KNEBmAqB#TSgLxQoqzRiCdFC4JhUetyCiEQTtgENESJd9X8Pc8iI https:/...

I mean that there is no such thing as importing.

There is. See it on the screenshot below.
https://i.imgur.com/Zgn9u5l.png

Could you upload a sample file?

I have merged your topics. Plese don't duplicate topics ever again.

As for your question, UnityEx has reimport function. Does it not work for you?

Is it possible that unknown data block inside NAM_1.dat contains size checks for these 3 chunks?

It is possible, but you don't know it for sure until you reverse engineer the whole file format.

I was able to make some progress on researching these images and I have written a Python tool to automate extraction process from NHL 2002. Few other types from other games are also partially supported. Here is my tool <link removed because it's outdated, see info below> And some showcase below: htt...

Do you have a batch translation tool?

No.

This looks like standard Unity game.
There are tools for that like UnityEx, Asset Studio or Unity Asset Explorer.

There's no way to edit it.？

Yeah, there are no tools for this. You can always use hex editor if that is fine for you.

I don't think that the NAM_2.bal pointers are within the unknown data block inside NAM_1.dat; that wouldn't make sense, since that block is located above pointers block. I think that NAM_2.bal pointers are inside NAM_1.dat's pointer block. However, that pointer isn't the last one inside NAM_1.dat; ...

The list of available keys is here
https://cs.rin.ru/forum/viewtopic.php?f=10&t=100672

You can also put there any request for new keys.