Copilot Studio agent accepts and analyzes unsupported file type (.bat) in Teams and Test panel, contrary to documented file input list

Question

Copilot Studio agent accepts and analyzes unsupported file type (.bat) in Teams and Test panel, contrary to documented file input list

Govindappa Gari Reddisekhar Reddy 0

Hi all,

I’m testing file input on a Copilot Studio agent and seeing behavior that doesn’t match the documentation.

Documentation reference: Allow file input from users. It lists the supported file types as DOCX, CSV, PDF, TXT, JPG, PNG, WebP, and non-animated GIF. XLSX and PPTX are noted as experimental only.

What I did:

Turned on File uploads under Settings > Generative AI > File processing capabilities.
Uploaded a file named Test.bat. It contains plain instructional text, not a real batch script.
Tested in both the Test your agent panel in Copilot Studio and the Microsoft Teams channel.

Expected behavior: Based on the docs, I expected the .bat file to be rejected, ignored, or not processed, since it isn’t a listed supported type.

Actual behavior: In both Teams and the test panel, the agent read the file and replied with a summary of its contents.
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Answer 1

Carl-L 23,105 Microsoft External Staff Moderator

Hello Govindappa Gari Reddisekhar Reddy,

Welcome to Microsoft Q&A forum.

Before we proceed further, may I know if the same agent can read actual .bat file? What I think right now is, even though .bat file is not supported, copilot is still capable of reading the content if it is simple enough.

I'm waiting for your reply.

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