This article will explain which characters can cause problems with (Tested on Windows 7 by renaming files in Explorer.) If you check the ASCII chart here you will find that everything from the left column is excluded and certain characters from the remaining columns are also excluded. Thanks @Rmano. 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. (See, the Windows file system doesn’t allow question marks, slashes, quotes or spaces-at-the-end-of-folder-names whereas other operating systems do.) Not only are those raw filenames illegal, even adding a extension won’t help. In Windows, this character is used as a delimiter for separating folders from each other. Let us take the backslash \ as an example. ... Windows File Explorer is a tool used to navigate the Internet. In order to correct this issue, I called upon my brain to remember a few things from the Windows 95 days. Yes, in an ASCII based file system Path.GetInvalidFileNameChars() will guarantee you a safe file name. You can help protect yourself from scammers by verifying that the contact is a Microsoft Agent or Microsoft Employee and that the phone number is an official Microsoft global customer service number. For example, AUX.c and AUX.h are invalid. See also here. – Rmano Jan 30 '14 at 16:57. False. There used to be a freeware tool called delinvfile but they've gone and changed it to shareware/paid. ... eventually it will delete such files with illegal names. On finishing it will show a messages saying some files were fixed. For Perl Scripts that lets you know which files have bad names, see: Perl Scripts For Mac/Windows File Moving. Therefore, it is essential to play it safe and avoid common illegal directory and filename characters. File names can be up to 260 characters long—this includes the extension and path to the file Pretty annoying. 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). For instance "C:\Folder\Folder\File.txt". *" for each of the illegal/reserved characters, but is there an easier way to find all files that contain < > : " / \ | ? Mac and Windows File Conversion; Unicode Support in File Names: Windows, Mac, Emacs, Unison, Rsync, USB, Zip; For unix file name issues, see: On Unix Filename Characters Problem. 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". I have added a link to the wiki in my answer. I can find . Which of the following is an illegal Windows file name? That bit me when trying to look at some Linux source on a Windows box recently. -name "*\? homework_03.xlsx. 1. – user68186 Jan 30 '14 at 17:07. The project has over 10,000 files across several folders and I'll to identify the path for these files. To get the file name dir a dir /x. * Once I've identified, I would like to remove all such characters from each of these files. I've had this problem many times -- Windows is really aggravating about illegal file names, and it also complains about overly long file names too (if you're copinyg something to a deeply nested folder, for example). Tech support scams are an industry-wide issue where scammers trick you into paying for unnecessary technical support services. If you share files with windows, you have to avoid the colon : char, illegal in windows file names, which will create problems (and it does). This issue, I called upon my brain to remember a few from! 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