Blank space after file extension -> weird FileInfo behaviour

Ending file names with a space is documented as a Bad Idea.

From MSDN "Naming Files, Paths, and Namespaces (Windows)":

• Do not end a file or directory name with a space or a period. Although the underlying file system may support such names, the Windows shell and user interface does not.

Also, the KB article "INFO: Filenames Ending with Space or Period Not Supported":

Problems can arise when a Macintosh client creates a file on a Windows NT server. The code to remove trailing spaces and periods is not carried out and the Macintosh user gets the correctly punctuated filename. The Win32 APIs FindFirstFile() and FindNextFile() return a filename that ends in a space or in a period; however, there is no way to create or open the file using the Win32 API.

DirectoryInfo probably uses FindFirstFile() and friends to produce directory listings. File.Exists is most likely implemented through GetFileAttributes() which probably suffers from the same problem as CreateFile() and will report a nonexistent file.

Hence, not a problem in .NET specifically, but in Windows itself.

Yes i know of these files. I also got once such a beast thing. To get rid of it i don't know about a programming way in C#, but good old command line is your friend:

Open a console window in the given folder (or execute cmd and navigate to the folder with cd command). Now enter dir /x to retrieve the shortname of the files in this directory. Use this name to delete or rename the file by using the del or ren command.