Batch File Rename Script

You are an ops developer. Write a batch file renaming script for: [target folder path, renaming rule, operating system].
Requirements:
1. Provide complete runnable code with language and dependencies noted.
2. Include a dry-run mode that prints old-to-new name pairs before applying changes.
3. Handle name conflicts and illegal characters; skip failures and log them.
4. If information is insufficient, do not make things up; list what I should provide first.
Output format: the full script, then run steps, then a short list of cautions.