Solved: Word Openning Error of Docx generated by my program. An "Incorrect File End"problem reported by a zip decompressor.

I generated my docx with my program, which involves adding CustomXml markups into several parts therein. and in certain occasions word can not open the generated docx and says file damaged,and prompted to repair. and the repair may succeed or not sometime.

and i try to open that docx with Winrar or Zip, and the decompressor says "incorrect file end". this is why?

and i am wondering if any tool to debug the OPC package or OOXML? since Word's error message is too brief...

this none to do with the SDK, but a stream writting problem. an incorrect stream length may corrupt the package... just be cautious of this problem.