The long name is not restricted to the 8.3-compliant format, but is restricted to a total length of 255 characters.
Web servers create lists of restricted file names for restricted files on the server.
However, because these lists do not contain any short file names of the files, restricted files can still be accessed through their short file name. This could enable an attacker to gain access to unauthorized files. Choosing to disable 8.3 file name creation increases both security and performance on the Web server, but it can cause problems when running 16-bit applications. Find the installation program you downloaded to your computer. Double-click the program icon to start the installation.