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