1、首先我们打开电脑里的proe软件进入软件主界面。
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2、然后我们找到并点击界面左上角的菜单栏里的打开图标，进行打开文件的操作。
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3、然后我们在类型中选择stp，step格式，即可对应直接打开stp格式的文件。我们找到你要打开的文件，选择右下角的打开。
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4、然后此时软件会弹出对话框，我们直接在对话框里选择确定即可。
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5、回到软件主界面我们就会发现此时已经打开了stp文件了。
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STP文件是cad绘图软件的3D图形文件的格式（扩展名），其中包含三维对象的数据；提供对产品模型数据交换的支持。是基于ASCII格式符合STEP应用协议ISO10303-21标准的正文编码的交换结构的三维图像数据。STP文件使用CATIA（计算机辅助三维交互应用）软件打开，通常在不同平台下有很多这类软件可以打开STP格式文件，Windows系统下就有大家熟知的UG、PRO-E、FreeCAD等，其中FreeCAD有跨Windows、MacOSX、Linux三种系统平台的不同版本。
以PRO-E为例
stp打开方法：
1、需要打开stp文件首先我们需要从网上下载：PRO-E软件；
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2、打开PRO-E软件，选择文件打开，将类型改为所有文件，如图：
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3、选择要打开的stp文件，如图所示：
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4、接着我们将输入新模型的类型改为零件，如图：
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5、到这里点击确定之后我们就可以打开stp文件啦，此时我们可以看到stp文件中的内容。
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