# Unique Tech Tree name is still not working in custom data mod

**URL:** <https://forums.ageofempires.com/t/unique-tech-tree-name-is-still-not-working-in-custom-data-mod/289887>\
**Category:** II - Report a Bug\
**Created:** [September 23, 2026, 11:48am UTC](https://forums.ageofempires.com/t/unique-tech-tree-name-is-still-not-working-in-custom-data-mod/289887 "2026-09-23T11:48:38Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Rass](https://forums.ageofempires.com/user_avatar/forums.ageofempires.com/rass/32/146888_2.png) [@Rass](https://forums.ageofempires.com/u/Rass)\
**Post date:** [September 23, 2026, 11:48am UTC](https://forums.ageofempires.com/t/unique-tech-tree-name-is-still-not-working-in-custom-data-mod/289887/1 "2026-09-23T11:48:38Z")

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### ▶ GAME INFORMATION

👇 _These details are CRITICAL; DO NOT skip them or your issue may not be reviewed._

- **GAME BUILD #:** 185872
- **GAME PLATFORM:** Steam
- **OPERATING SYSTEM:** Windows 11

### ▶ ISSUE EXPERIENCED

It is still not possible to use a custom tree; it only works if we use the original naming convention.

### ▶ FREQUENCY OF ISSUE

👇 _How often does the issue occur? CHOSE ONE; DELETE THE REST!_

- **100%** of the time / matches I play (ALWAYS)

### ▶ REPRODUCTION STEPS

The file paths are located in the “dat” folder in your mod: resources/\_common/dat

1. Open the civilization.json file.

2. Change the value of the ‘tech\_tree\_name’ key in a selected civilisation. EG: in Britons civ, second item in array. BRITONS to ENGLISH

3. Create a folder named “CivTechTrees,” then copy an existing civilization’s technology tree (e.g., BRITONS.json) into that folder.

4. Rename the file to the value you specified for ‘tech\_tree\_name’ in the civilizations.json file for the civilization you selected. (BRITONS.json → ENGLISH.json)

5. Open the JSON file located in the CivTechTree folder that contains your civilization’s technology file.

6. Edit the value of the “civ\_id” key to match the name you previously specified in the civilizations JSON file for the “tech\_tree\_name” value of the civilization you want to edit. (BRITONS → ENGLISH)

7. After you’ve successfully saved your changes, open the game and load the mod in single-player mode. Select the edited civilization, then click the technology tree button.

Completely empty, custom tech tree does not display. It still doesn’t work even after reimporting and restarting!

### ▶ EXPECTED RESULT

👇 _What was SUPPOSED to happen if the bug you encountered were not present?_

The game should read the technology’s tree file and display it the items!

### ▶ IMAGE

👇 _ALWAYS attach a PICTURE (.jpg, .png, .gif) or VIDEO (.mp4, YouTube link) that highlights the problem._

 ![t1](https://forums.ageofempires.com/uploads/default/original/3X/f/9/f9faf57eafd6c70ac0a747bea38243f58c75e8d2.jpeg)  
 ![t2](https://forums.ageofempires.com/uploads/default/original/3X/a/c/accefca216f363559b0afb3b522fb8614b283b16.jpeg)

### ▶ GAME FILES (SAVE / RECORDING)

👇 _Attach a SAVE GAME (.aoe2spgame) or GAME RECORDING (.aoe2record) of the match where you encountered the issue. Link it below if using an external file service._

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<div class="post-metadata">

**Author:** ![aoescout](https://forums.ageofempires.com/user_avatar/forums.ageofempires.com/aoescout/32/25351_2.png) [@aoescout](https://forums.ageofempires.com/u/aoescout)\
**Post date:** [October 12, 2026, 10:57am UTC](https://forums.ageofempires.com/t/unique-tech-tree-name-is-still-not-working-in-custom-data-mod/289887/2 "2026-10-12T10:57:51Z")

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This issue is now tracked on our side, thank you for the report.