Definition: The 'FtpSave.dll' is a Windows API function used by Microsoft to save the contents of a file to an FTP server, including metadata. Definition: The 'FtpSave.dll' function in Windows can be used to store or modify the contents of a file on an FTP server for later retrieval. It saves the file's size and date time information onto the server before transferring it over the network. It allows users to save files on their computers, as well as to access them from other computers.