Copy part or all of a file name

FreeComander. a file manager I explored before finding DOPus provides buttons for copying either full file name (including the path) or just the path or just the file file name. Is there ay way do do this in DOpus?

FC also has some nice tools for renaming one or multiple files one of them puts the file extension in a separate field making it very easy to change only the extension.

TIA

See the FAQ: Copy selected filenames to the clipboard.

Regarding renaming, when you rename "inline" push Ctrl-E (or keep hitting F2) to select just the extension. Or use the rename button on the toolbar to let you do things like rename from *.jpg to *.jpeg when you want to change lots of extensions.