To resolve this behavior, you need to set the System locale to Chinese.
To set it, follow the below steps in Windows:
1. Open the Control Panel -> Clock and Region/Region -> Administrative tab -> Change system locale... button -> set Current system locale to Chinese (Simplified, China).
2. Restart the machine and launch the Spotfire Analyst.
3. Now the Chinese characters are displayed correctly, below is the corresponding screenshot:
Note: After the computer restarts, we need to recreate the analysis file so that the Chinese characters are not garbled anymore. The existing DXP/analysis file will still have the garbled characters because that's how they were saved before setting the system locale properly.