Your machine or some part of it may not function properly if you name a file or folder incorrectly.

Use the list of rules below to see if you have made these errors and may want to correct them.

Folder names

  • Folder names shouldn't be longer than 100 characters including spaces.
  • 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.

File names

  • File names shouldn't be longer than 100 characters including spaces.
  • File paths shouldn't be longer than 255 characters including spaces.
  • 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
    • -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

If you find yourself with a large number of files or folders which are badly named, then you can use this small application to fix the problem: