It is possible in UGENE opening text data and files by pasting them into the Project View from the clipboard.
Select text data in a browser or in a text editor or file(s) from your system and press Ctrl+C (Cmd+C for Mac OS X).
Switch to UGENE with an opened project, click the project area and press Ctrl+V (Cmd+V).
The copied data or file(s) will be opened in UGENE.
Another way for file(s) is drag’n’drop. Using your mouse, drag and drop the files from the file system to UGENE, and they will be opened by the program.