ConvertFromURL Function
將檔案 URL 轉換成系統檔案名稱。
ConvertFromURL (filename)
String
filename: A file name as a string.
    systemFile$ = "c:\folder\mytext.txt"
    url$ = ConvertToURL( systemFile$ )
    print url$
    systemFileAgain$ = ConvertFromURL( url$ )
    print systemFileAgain$