An array containing the characters that are not allowed in file names. For more information about file streams, see File Streams. The following example demonstrates the GetInvalidFileNameChars method and the GetInvalidPathChars method to retrieve invalid characters. While single spaces are allowed between words or characters in the file name, do not use two or more spaces in a row between words or characters as this will cause errors. What characters are allowed in filenames for HTML files on servers? This article will explain which characters can cause problems with Summary: Illegal file/folder names and conventions for the following operating systems: Windows Mac OS 9 Mac OS X Description: ===== EXPLANATION & OVERVIEW In the realm of cross-platform file sharing, sometimes the end users are not aware of the limitations posed by the operating system. The following file names are invalid: Let us take the backslash \ as an example. In Windows, this character is used as a delimiter for separating folders from each other. In the case of cleaning a file name of bad characters Regex works fine. If a file or folder you’re trying to upload to OneDrive for Business contains any of the characters listed below, rename the file or folder to remove these characters before trying to upload. Some characters, i think, may be a bad idea to include in file names, although the filesystem allows them. E.g. On a … That totally depends on the server. If backslashes were allowed in filenames, we could not say whether "Fi\le.txt" is the name of a file or whether it is the file "le.txt" located in the folder "Fi". For more tips on creating your PDFs for your text attachments, visit our page on PDF guidelines. < > | Windows aso has a specific set of restricted filenames. Nomadesk is not able to synchronize files with filenames containing invalid characters. While we're on the topic of sheet names, the one word you can't use by itself as a sheet name is the word History. Certain characters have intrinsic meanings when used in filenames in SharePoint and Windows, such as "*" for wildcards, or "\" as a directory separator. These other characters have special meanings when used in file names in OneDrive, SharePoint, Windows and macOS, such as "*" for wildcards, "\" in file name paths, and names containing .lock, CON, or _vti_. For instance "C:\Folder\Folder\File.txt". In ASCII a horizontal tab has the decimal character code of 9, which Windows does not allow in filenames. Simple because these characters have other meanings to the file system or to the command prompt (where file naming rules were originally created.) the following characters are not allowed on Windows: \ / : * ? " For a Windows Form application the better solution for file and path names would be to use the SaveFileDialog control that does all path and file validation for you and will not allow the user to input invalid names or navigate to a directory they do not have permission for. HTTP itself allows any character at all, including control characters and non-ASCII characters, as long as they are suitably %-encoded when requested in a URL. Similarly, although non-ASCII characters are allowed in filenames and Perforce identifiers, entering these characters from the command line may require platform-specific solutions. On the Windows platform there are a couple of characters which aren't allowed in filenames. If you're not dealing with a lot of filenames in the raw shell, most filemanagers will deal with it for you, and nautilus, for example just throws a message about the forward slash character. Examples. File names should NOT contain ampersands (“&”). 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