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Dolphin: add item to the context menu


in Dolphin it is possible to open a context menu at a file. (point to a
file and click the secondary button of you pointing device)

Dependend of the file type you get a few action options. (e.g. Burn the
file with k3b if the file is an ISO)

I want to add an entry to this context menu to get the checksum of the
file. Is anybody here who can lead me thougth this process?