【问题描述】
用 UiPath (2019.3.0 Community Edition) 编写了一个Tool，用 While 循环把整数从 10 ，每次循环+1，一直加到100，并利用 Append Text (UiPath.Word.Activities.DocumentAppendText) 把每次的值存入到Word文件中，但是在保存到 Word 时 Append Text 报错，下图是 Designer panel 的 workflow 和 异常截图
以下是详细的报错信息：
An ExceptionDetail, likely created by IncludeExceptionDetailInFaults=true, whose value is: System.IO.FileFormatException: Archive file cannot be size 0. at UiPath.Word.FileDocument..ctor(String documentPath, Boolean createNew) at UiPath.Word.Activities.DocumentActivity.BeginExecute(AsyncCodeActivityContext context, AsyncCallback callback, Object state) at System.Activities.AsyncCodeActivity.InternalExecute(ActivityInstance instance, ActivityExecutor executor, BookmarkManager bookmarkManager) at System.Activities.ActivityInstance.Execute(ActivityExecutor executor, BookmarkManager bookmarkManager) at System.Activities.Runtime.ActivityExecutor.ExecuteActivityWorkItem.ExecuteBody(ActivityExecutor executor, BookmarkManager bookmarkManager, Location resultLocation)
问题关键点：
Append Text: Archive file cannot be size 0.
【解决方法】
原因：
程序中调用的Word文件是新建的，没有被打开过，也没有被编辑过
操作：
把调用的 Word 文件打开，随意写点字再删掉，然后保存，再次运行就不报错了
UiPath - issue - "Append Text: Archive file cannot be size 0." (UiPath.Word.Activities v1.3.0)
原文：https://www.cnblogs.com/coco1989/p/10659525.html