User dictionary file can be copied manually. Please follow these steps to import.

1. Copy VOCALOID2 user dictionary file (*.udc) to other place (i.e. desktop).
* .udc is hidden file, so please change the settings of the explorer so that it shows such file. And *.udc file is located in the following folder.

C:\Users\(user name)\AppData\Local\VirtualStore\ProgramFiles\VOCALOID2\UDIC

2. Open copied dictionary file with your text editor which supports unicode, and save the file with another name and unicode encoding.

3. Place the file saved in step 2 to the following folder.

C:\Users\(user name)\AppData\Roaming\VOCALOID3\UDIC\1

4. Launch VOCALOID3 Editor or Tiny VOCALOID3 Editor and click [Lyrics] → [User Dictionary] → [English] from the menu bar to show user dictionary dialogue.

5. Select the file copied in step 3 on "User Dictionary" combo box, and click "Close".