Eou-tmg-(undub)-decrtd-ziperto.rar -

Based on the file naming convention, refers to a specific, modified ROM file for the Nintendo 3DS game Etrian Odyssey Untold: The Millennium Girl .

This indicates the ROM has been modified to include the original Japanese voice acting while retaining English text. This is highly desired by fans who prefer the original audio over dubbed versions. EOU-TMG-(UNDUB)-DecrTD-Ziperto.rar

If you're asking about this for technical or archival reasons, I can also explain: How to What the differences are between this and the original Where to find other similar modified ROMs Based on the file naming convention, refers to