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To specify intial content for a file, the origin has to be an absolute file path or an URL URI with the platform scheme of Eclipse. Such an URL URI has the form plaftorm:/plugin/a.plugin.name/folder/in/the/plugin/file.txt

Specifying intial content for a folder is analog. Its origin has to be an absolute directory path or an URL URI in the form plaftorm:/plugin/a.plugin.name/folder/in/the/plugin

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