Start New Discussion If your reading this you're probably at the point of trying to install a new WSUS server on Windows Server 2012 R2 and have received the message "Fatal Error: Illegal characters in path". Therefore, it is essential to play it safe and avoid common illegal directory and filename characters. You may have created a partition specifically for the task, i.e. Fix 2 – Fix Shell Folders Via Registry. - Any other character that the target file system does not allow. Illegal characters in path. The colon is an illegal character in both types of OS, as it is used in both systems to differentiate between files and folders in a file path. ; Type “regedit“, then press “Enter“.The Registry Editor appears. Hold the Windows Key and press “R” to bring up the Run dialog. In the case of cleaning a file name of bad characters Regex works fine. I’m sorry to know after upgrading to Windows 10 when you try to update a program that exists on Computer you are getting error: The folder path 'Program Files' contains an invalid character. Windows 95 abandoned that to allow long file names, but still limited the maximum path length (which includes the full folder path and the file name) to 260 characters. Your interest in Windows 10 is much appreciated. Please add a write line so you can visualize it better if you’re not sure which character might be just copy-paste it and we will help you . windows 10.0 visual studio 2017 version 15.3 Lukáš Forst reported Aug 23, 2017 at 10:34 AM If a file or folder you’re trying to upload to OneDrive contains any of the characters listed below, it may prevent files and folders from syncing. Welcome to Microsoft Community. Navigate to the following location in the Windows Registry: activities, error, string, question ... this means that you have chars that are not valid in windows. Before Windows 95, Windows only allowed file names that were eight characters long, with a three character file extension–commonly known as an 8.3 filename. Many of these illegal characters are allowed for naming files and folders when using the Mac OS®, however, since the programming behind these systems is different. created a … Build. - Integer value zero, sometimes referred to as the ASCII NUL character. Invalid characters. Your web files will be viewed by numerous users who use a wide variety of operating systems (Mac, PC, and Linux for instance) and devices (desktops, tablets, and smartphones are some examples). - Characters whose integer representations are in the range from 1 through: 31, except for alternate data streams where these characters are: allowed. 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. Applies to: Certain characters have special meanings when used in file names in OneDrive, SharePoint, Windows and macOS, such as "*" for wildcards, and "\" in file name paths. Start or search. For more information about file streams, see File Streams. Illegal characters in path. Illegal Characters in path. I appreciate the efforts who took to resolve the issue. Most filesystems are fairly permissive: for example, all NTFS, extN, btrfs, XFS and ReiserFS allow everything except 1) the null byte and 2) the slash /.. The fix is annoyingly simple. The operating system may have its own restrictions. In particular, the Win32 0 API disallows * ? Exception Details: System.ArgumentException ... 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