Old DOS/Windows programs that don't understand the 'long filename' technology are supported by a "translator" in Windows. Long names are truncated to six characters, followed by a tilde, followed by a number. Usually, it is "~1", but if there are multiple files/folders that would be identical when truncated to six chars, additional numbers are used, as needed, e.g., FILENA~1, FILENA~2, etc.