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@elfed - do you mean .opf files. Apparently the .opi file type is associated with Avaya (a contact management system) which AFAIK has nothing to do with the Calibre book manager.
If by 'Add Files' you mean the Add Files to selected book records function, then. if the file type you're trying to add is not a ebook type recognised by calibre then you need to set the file type selector to All files. On Windows the file type selector is a drop down list to the right of the File name. The default is a list of those ebook file types previously mentioned - .opf and .opi are NOT ebook file types
BR
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