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Thirdly: I was wondering if you could test my own little tool which does exactly the same as the website: http://doena-soft.de/dvdprofiler/3.6.0/AsinToEanConverter.zip
For the next time you are bored I have a suggestion: This tool would be even more useful if it would be integrated into a browser-toolbar.
I'm not really good at the whole plugin thingy [...] And browser plugins can't be written in my area of expertise, C#.
Means you have to be really bored to do this?