Bas =Visual Basic Module 模块Cls=Visual Basic Class Module 类模块Frm=Visual Basic Form File 窗体Res=Compiled Resource Script 资源Vbp=Visual Basic Project 工程Vbw=Visual Basic Workspace 工作空间Scc=Microsoft SourceSafe Status 版本信息Frx=Visual Basic Form Binary File 窗体的二进制文件Ctl=Visual Basic User Control 用户控件