Hello cheese_m
Hope this finds you well.
M365 Copilot supports a wide range of file types across various applications. Here is a full list of the file formats supported by the chat experience in Copilot for Microsoft 365 and Microsoft Copilot Pro:
Adobe: pdf
Images: gif, jfif, pjpeg, jpeg, jpg, pjp, png, webp
Microsoft Office (Word, PowerPoint, Excel, Loop): doc, docx, fluid, loop, ppt, pptx, xlsx
OpenOffice: odt, odp
Rich Text Format: rtf
Text and Code: txt, py, ipynb, js, jsx, css, java, cs, php, c, cpp, cxx, h, hpp, rs, R, Rmd, swift, go, rb, kt, kts, ts, tsx, m, scala, rs, dart, lua, pl, pm, t, sh, bash, zsh, csv, log, ini, config, json, yaml, yml, toml, lua, sql, md, coffee, tex, latex, aspx
Web / Hypertext: htm, html
Reference article: File formats supported by Copilot - Microsoft Support
In case you have any further queries, please let me know.
Best Regards,
Ashraf.