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check these links it might help you:<br />
<br />
<a href="http://social.msdn.microsoft.com/Forums/en-US/oxmlsdk/thread/34701a34-f1d4-4802-9ce4-133f15039c69" rel="ugc nofollow">http://social.msdn.microsoft.com/Forums/en-US/oxmlsdk/thread/34701a34-f1d4-4802-9ce4-133f15039c69</a><br />
<a href="http://social.msdn.microsoft.com/Forums/en-CA/worddev/thread/f1582aee-b8bb-433e-bf87-cd4c9670e98c" rel="ugc nofollow">http://social.msdn.microsoft.com/Forums/en-CA/worddev/thread/f1582aee-b8bb-433e-bf87-cd4c9670e98c</a><br />
<a href="http://social.msdn.microsoft.com/Forums/en-US/vsto/thread/991af08f-d80e-4604-828d-d54dde8fc7bf" rel="ugc nofollow">http://social.msdn.microsoft.com/Forums/en-US/vsto/thread/991af08f-d80e-4604-828d-d54dde8fc7bf</a>
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check these links it might help you:

http://social.msdn.microsoft.com/Forums/en-US/oxmlsdk/thread/34701a34-f1d4-4802-9ce4-133f15039c69 [http://social.msdn.microsoft.com/Forums/en-US/oxmlsdk/thread/34701a34-f1d4-4802-9ce4-133f15039c69]
http://social.msdn.microsoft.com/Forums/en-CA/worddev/thread/f1582aee-b8bb-433e-bf87-cd4c9670e98c [http://social.msdn.microsoft.com/Forums/en-CA/worddev/thread/f1582aee-b8bb-433e-bf87-cd4c9670e98c]
http://social.msdn.microsoft.com/Forums/en-US/vsto/thread/991af08f-d80e-4604-828d-d54dde8fc7bf [http://social.msdn.microsoft.com/Forums/en-US/vsto/thread/991af08f-d80e-4604-828d-d54dde8fc7bf]

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Thank you for feedback! Some of the links are known to me. So we must open the docs programmatically &nbsp;(each format with help of the corresponding class) and must check the property HasPassword. <br />
Is this the only effective way ? 
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Thank you for feedback! Some of the links are known to me. So we must open the docs programmatically  (each format with help of the corresponding class) and must check the property HasPassword.
Is this the only effective way ?

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How to identify (programmatically, .Net) if an office document (word, excel, access, powerpoint, ..) is &nbsp;password protected? 
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How to identify (programmatically, .Net) if an office document (word, excel, access, powerpoint, ..) is  password protected? 

How to find password protected office documents

The .NET Framework is not specific to any one programming language; rather, it includes a library of functions that allows developers to rapidly build applications. Several supported languages include C#, VB.NET, C++ or ASP.NET.