Today we a ticket which was escalated by the second level support to the engineering. A customer could not download, remove or rename the file via FTP. The Hosting is running on a Windows Server 2003 R2 with IIS6. After checking the file on the filesystem I saw that the filename had a space in before.
You cannot really name a file like that with a windows machine. But Linux and Unix systems like Mac OS X allow this.
After renaming the file to a normal Windows filename, the customer you download the file again.
Btw you can simple rename the file with powershell
Rename-Item " filename.html" "newfilename.html"