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 20 Reputation points
2026-10-08T18:27:42.7266667+00:00

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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Carl-L 23,535 Reputation points Microsoft External Staff Moderator
2026-10-14T13:17:08.07+00:00

Hello Govindappa Gari Reddisekhar Reddy,

Thanks for replying.

For this, I'd simply treat this as a discrepancy between the supported files lists rather than a bug. Also, I wouldn't be so surprised if Copilot can read a .bat file. These files are basically plain text file containing Windows commands, you can create one using notepad and open one in it and read all of the contents. Which I believe Copilot can also read the content normally and interprets the content to generate the answer.

I hope this clarifies.

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  1. Govindappa Gari Reddisekhar Reddy 20 Reputation points
    2026-10-13T19:42:31.2566667+00:00

    Hello Carl,

    Thanks for reaching out. I have tested with few text added and converted into .BAT it is reading and analyzing content in it.

    I also, tried one actual .bat file with information about Quick tool box menu. But agent is reading and providing answer. Sample content in .BAT file

    Looking forward to your reply!
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  2. Carl-L 23,535 Reputation points Microsoft External Staff Moderator
    2026-10-09T07:07:47.41+00:00

    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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