I worked on older versions of SharePoint where we can upload different file types which were not supported in SharePoint online. Normally user face this issue during migrations from older version.

Restricted Characters in file/folder names

Below is the list characters which you can not used in file name or folder name in SharePoint Online and OneDrive:

  • ” * : < > ? / \ |

Unsupported file names

Below is a list file names which you can not use in SharePoint online or OneDrive:

  • .lock, CON, PRN, AUX, NUL, COM1 – COM9, LPT1 – LPT9, _vti_, desktop.ini

You can use ~ at the start of folder name as it have different meaning SharePoint and also can not use Forms folder at the root of document library because there is already a default forms folder at the root of each document library.

Restricted File types

Recently Microsoft have removed the limitations on file types that can be added. You can save all file types in OneDrive and SharePoint online but they will not work until unless your sharepoint site allows to run custom script. Custom script is blocked on SharePoint online root site collection and also on group sites. Below are a few filetypes which can work if custom scripting is enabled:

.aspx, .asmx, .ascx, .master, .xap, . swf, .jar, .xsf, .htc

Adnan, a distinguished professional, boasts an impressive track record as a Microsoft MVP, having achieved this prestigious recognition for the eighth consecutive year since 2015. With an extensive career spanning over 18 years, Adnan has honed his expertise in various domains, notably excelling in SharePoint, Microsoft 365, Microsoft Teams, the .Net Platform, and Microsoft BI. Presently, he holds the esteemed position of Senior Microsoft Consultant at Olive + Goose. Notably, Adnan served as the MCT Regional Lead for the Pakistan Chapter from 2012 to 2017, showcasing his leadership and commitment to fostering growth within the tech community. His journey in the realm of SharePoint spans 14 years, during which he has undertaken diverse projects involving both intranet and internet solutions for both private and government sectors. His impact has transcended geographical boundaries, leaving a mark on projects in the United States and the Gulf region, often collaborating with Fortune 500 companies. Beyond his roles, Adnan is a dedicated educator, sharing his insights and knowledge as a trainer. He also passionately advocates for technology, frequently engaging with the community through speaking engagements in various forums. His multifaceted contributions exemplify his dedication to the tech field and his role in driving its evolution.

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