open office file

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C#

When i work with process class, it can run all files except office files. In this state(open office file for example .doc or .docx or .ppt , ...) I give this error:

The system can not find the file specified.

Anybody can say me, why this happen?

For example this code give previous error:

<br />
System.Diagnostics.Process process = new System.Diagnostics.Process();<br />
process.StartInfo.FileName = "c:\\document.doc";<br />
process.Start();<br />