Many .rar files from 2006-2010 contain packed executables that modern antivirus flags as Trojan.PLC or Generic.Malware. Some are false positives (due to kernel-level USB access), but others are genuine keyloggers or ransomware. Always sandbox in a VM.
The 2006-09-11 RAR files refer to a specific set of files used for unlocking Simatic S7 200 and S7 300 MMC passwords. These files contain software tools and utilities designed to bypass or reset the password.