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Information about the characters that you cannot use in site names, folder names, and file names in SharePoint

This article lists the characters that you cannot use in the following names in Microsoft SharePoint:

  • File names
  • Folder names
  • Site names
  • Server names

File names

  • You cannot use the following characters anywhere in a file name:
    • Tilde
    • Number sign
    • Percent
    • Ampersand
    • Asterisk
    • Braces
    • Backslash
    • Colon
    • Angle brackets
    • Question mark
    • Slash
    • Pipe
    • Quotation mark
  • You cannot use the period character consecutively in the middle of a file name.
  • You cannot use the period character at the end of a file name.
  • You cannot start a file name by using the period character.
  • If you use an underscore character (_) at the beginning of a file name, the file will be a hidden file.
  • File names and folder names may not end with any of the following strings: 
    • .files
    • _files
    • _files
    • -Dateien
    • _fichiers
    • _bestanden
    • _file
    • _archivos
    • -filer
    • _tiedostot
    • _pliki
    • _soubory
    • _elemei
    • _ficheiros
    • _arquivos
    • _dosyalar
    • _datoteke
    • _fitxers
    • _failid
    • _fails
    • _bylos
    • _fajlovi
    • _fitxategiak
  • In addition, file names and folder names cannot start with the “_vti_” string, such as the followings:
    • _vti_cnf
    • _vti_pvt
    • _vti_bin
    • _vti_txt

Folder names

  • You cannot use the following characters anywhere in a folder name or a server name:
    • Tilde
    • Number sign
    • Percent
    • Ampersand
    • Asterisk
    • Braces
    • Backslash
    • Colon
    • Angle brackets
    • Question mark
    • Slash
    • Pipe
    • Quotation mark
  • You cannot use the period character consecutively in the middle of a folder name.
  • You cannot use the period character at the end of a folder name.
  • You cannot start a folder name with a period character.
  • If you use an underscore character (_) at the beginning of a folder name, the folder will be a hidden folder.
  • Additionally, a folder that contains the string "_vti_" is reserved by SharePoint, and isn’t supported.

Site names, subsite names, or site group names

You cannot use the following characters anywhere in a site name, in a subsite name, or in a site or Active Directory group name:

  • Tilde (~)
  • Number sign (#)
  • Percent (%)
  • Ampersand (&)
  • Asterisk (*)
  • Braces ({ })
  • Backslash (\)
  • Colon (:)
  • Angle brackets (< >)
  • Question mark (?)
  • Slash (/)
  • Plus sign (+)
  • Pipe (|)
  • Quotation mark (")
  • You cannot start a site name, a subsite name, or a site group name with an underscore (_) character or with the period (.) character.
  • When you create a site name, a subsite name, or a site group name, you cannot use strings that were already used to name managed paths.
  • You cannot use the period character consecutively in the middle of a site name, a subsite name, or a site group name.
  • You cannot use the period character at the end of a site name, a subsite name, or a site group name

See full Microsoft article at https://support.microsoft.com/en-us/kb/2933738.  This article also contains a download button for a Fix File utility that will rename files that contain incorrect characters.

 

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