问题源于：wexbim文件CORS policy HTTP404
IE Edge 提示：
HTTP404: 找不到 - 服务器尚未找到与请求的 URI (统一资源标识符)匹配的任何内容。
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火狐提示
uncaught exception: Failed to fetch binary data from server. Server code: 404. This might be due to CORS policy of your browser if you run this as a local file
xbim团队在tutorials中提示：
If it still doesn't work check your webserver is serving wexBIM file as a
static content.
解决方案：
需要配置 web config文件
<system.webServer>
<staticContent>
<mimeMap fileExtension=".wexbim" mimeType="application/octet-stream" />
</staticContent>
</system.webServer>
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