You cannot open part10 on its own. You need every preceding part (1 through 9) and any subsequent parts in the same folder.
Do you have downloaded and ready to extract? City.Bus.Manager.v1.0.7.0.part10.rar
The software recognizes the sequence and automatically pulls data from all the parts (including your part10 ) to recreate the original game folder. A Quick Warning You cannot open part10 on its own
v1.0.7.0 indicates this is a specific update of the game. For the game to work, every single part (part1, part2, etc.) must be the exact same version. How to "Put it Together" The software recognizes the sequence and automatically pulls
To make large games easier to upload and download, they are often split into smaller "parts." You have the 10th segment of that set.
You generally only need to right-click Part 1 and select "Extract Here" using a program like WinRAR or 7-Zip .