Forum Discussion

Copper Contributor

Jun 21, 2022

Lowercase file extensions vs Uppercase file extensions within a SharePoint List

Currently I am running into an issue within a SharePoint Online list, in an attachments column, documents are opening in the browser if they are named with a lowercase file extension and asking the u...

SharePoint Online

ganeshsanap

MVP

Jun 22, 2022

hitty08 Strange! I am unable to replicate this issue on my SharePoint tenant. I just tried with .xlsx & .XLSX and .docx & .DOCX files and both are opening fine in browser.

Was this working for you before this?

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hitty08

Copper Contributor

Jun 22, 2022

This is the first time I am hear this being an issue and to be honest I have never really payed attention to the Uppercase vs Lowercase extensions because it has never been an issue.

I do think now that I have looked deeper into this it is only with .pdf's

ganeshsanap
MVP
Jun 23, 2022
hitty08 This is working for PDF files as well on my SharePoint site.
Can you try creating a new list in same site or another site and check if you can reproduce the same?
Which browser are you using?
Check this thread for browser settings for PDF files if it helps: How to change browser download settings for PDF files
Please click Mark as Best Response & Like if my post helped you to solve your issue. This will help others to find the correct solution easily. It also closes the item. If the post was useful in other ways, please consider giving it Like.