Select "Extract Here" or "Extract to [Folder Name]." The software will automatically read through all the parts, including your .006 file, to rebuild the original video. Troubleshooting:
Right-click only on the first file (ending in .7z.001 ). videos.7z.006
If part .006 is the only one you have, you cannot view the video. You need the preceding five parts to complete the data. Select "Extract Here" or "Extract to [Folder Name]