SharePoint Reserved folder names in SharePoint server 2016 and 2019 latest update

OLAGANATHAN RAJARAJAN 0 Reputation points
2023-02-07T14:26:48.36+00:00

Hi,

Users are not able to create the folder names like ACER, AWS, RWS in SharePoint Server 2016 and 2019 Document Library, users are getting the following error message "The file you are attempting to save or retrieve has been blocked from this Web site by the server administrators.”

Need to know a list of all reserved names for SharePoint Library that could not use to create folder.

SharePoint Server
SharePoint Server
A family of Microsoft on-premises document management and storage systems.
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SharePoint
SharePoint
A group of Microsoft Products and technologies used for sharing and managing content, knowledge, and applications.
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  1. Haoyan Xue_MSFT 18,841 Reputation points Microsoft Vendor
    2023-02-08T02:14:23.7766667+00:00

    Hi @OLAGANATHAN RAJARAJAN

    By default, several standard file extensions are blocked on Microsoft Windows SharePoint Services, including any file extensions that are treated as executable files by Windows Explorer.The file extensions blocked by default are:

    ade, adp,app, asa, asp, bas, bat, cdx, cer, chm, class, cmd, com, cpl, crt, csh, dll, exe, fxp, hlp, hta, htr, htw, ida, idc, idq, ins, isp, its, jse, ksh, lnk, mad, maf, mag, mam, maq, mar, mas, mat, mau, mav, maw, mda, mdb, mde, mdt, mdw, mdz, msc, msi, msp, mst, ops, pcd, pif, prf, prg, printer, pst, reg, scf, scr, sct, shb, shs, shtm, shtml, stm, url, vb, vbe, vbs, wsc, wsf, wsh.

    Blocking file types not only blocks file extensions, but also folder names in the latest CU.

    Configuring Blocked File Types in SharePoint 2016, You can navigate to: Central Administration >> Security >> Define blocked file types.

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  2. Haoyan Xue_MSFT 18,841 Reputation points Microsoft Vendor
    2023-02-16T06:09:34.2566667+00:00

    Hi @OLAGANATHAN RAJARAJAN

    Microsoft fixes an issue in which blocked file extensions cause errors on folder and subsite creation and accessing.

    Reference: https://support.microsoft.com/en-us/topic/description-of-the-security-update-for-sharepoint-server-2019-february-14-2023-kb5002342-abd83b9f-b088-44fb-a583-f45337d83cba

    Please check if the problem has been solved in your environment?


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