Forum Discussion

hitty08's avatar
hitty08
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 user to download if they are named with a uppercase file extension. 

Does anyone know why this could be happening (if their is Microsoft documentation on it that would be great)? Right now I can convert all the files to be lowercase, but I am just wondering why this is happening. 

Thank you! 

SharePoint Online

4 Replies

Sort By
  • ArneSky's avatar
    ArneSky
    Copper Contributor
    Apr 05, 2024

    hitty08 : How can you convert the uppercase to lowercase easy for all files in a Sharepoint site?

  • ganeshsanap's avatar
    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?

    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.

    • hitty08's avatar
      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's avatar
        ganeshsanap
        MVP
        Jun 23, 2022

        hitty08 This is working for PDF files as well on my SharePoint site. 

        1. Can you try creating a new list in same site or another site and check if you can reproduce the same?
        2. 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.

Resources