How to read properties of file?

On windows, when you right click on any document tiff,jpeg or word etc.... you find various properties like SUMMARY ,KEYWORDS ..etc..
How can I read the values of those properties???

Is there any code snippet that can drive me through or start with???
I have very little idea about JNI and native APIs
How about COM ???..
However, I should be able to read the files and get info from both windows or unix... i.e the files storage shall be mounted on UNIX server from which I need to read..
Any help is appreciated !!!

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