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UCAT File - What is a .ucat file and how do I open it?

Learn about .UCAT files and view a list of programs that open them.

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Overview

What is a UCAT file? A UCAT file contains information about an attack used by Sil Games Undercreator, a tool for building Undertale ‑style fangames. It contains information about a monster's attack built with the Attack Designer included in Undercreator. UCAT files store information in a proprietary binary format.

More Information Undercreator is a tool for building games without coding that you can also play in Undercreator. Instead of coding, you can develop games, which includes adding monsters' attacks, using visual drag‑and‑drop capabilities. NOTE: UCAT files are one of several game data file types Undercreator uses, with others including .UCED files for encounters and .UCME files for maps.

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VerifiedVerified by FileInfo.com The FileInfo.com team has independently researched the Undercreator Attack file format and Windows apps listed on this page. Our goal is 100% accuracy and we only publish information about file types that we have verified. If you would like to suggest any additions or updates to this page, please let us know .

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DeveloperSil Games
Popularity2.0 | 1 Vote

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.UCAT File Extension

Undercreator Attack File

DeveloperSil Games
Popularity
2.0  |  1 Vote
 

What is a UCAT file?

A UCAT file contains information about an attack used by Sil Games Undercreator, a tool for building Undertale ‑style fangames. It contains information about a monster's attack built with the Attack Designer included in Undercreator. UCAT files store information in a proprietary binary format.

More Information

Undercreator is a tool for building games without coding that you can also play in Undercreator. Instead of coding, you can develop games, which includes adding monsters' attacks, using visual drag‑and‑drop capabilities.

NOTE: UCAT files are one of several game data file types Undercreator uses, with others including .UCED files for encounters and .UCME files for maps.

How to open a UCAT file

UCAT files are not meant to be opened. Instead, Undercreator loads the information in the UCAT file. You can find UCAT files in the C:\​Users\​[user]\​Desktop\​undercreatordemo\​Attacks game directory.

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Programs that open or reference UCAT files

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Sil Games Undercreator

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Category: Game Files

Updated: February 9, 2026

FAQ

What is a UCAT file?↓
A UCAT file contains information about an attack used by Sil Games Undercreator, a tool for building Undertale‑style fangames. It contains information about a monster's attack built with the Attack Designer included in Undercreator. UCAT files store information in a proprietary binary format.
How do I open a .ucat file?↓
UCAT files are not meant to be opened. Instead, Undercreator loads the information in the UCAT file. You can find UCAT files in the C:\​Users\​[user]\​Desktop\​undercreatordemo\​Attacks game directory.

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