1. Run Join (Merge, Combine) Multiple AVI Files Into One Software.
2. Click the "Add AVI File(s)" button to add files. Then an open file dialog will appear, hold CTRL or SHIFT key to select multiple files. To add all files in a folder, click "Add All AVI Files in Folder" then select a folder.
3. To start joining the selected files/documents, click the "Join To One AVI" button.