This indicates an attack attempt against a Code Injection vulnerability in Schneider Electric U.motion Builder.
The vulnerability is caused by a lack of validation to the parameter passed to "file_picker.php". A remote attacker may be able to exploit this to access arbitrary files on the system, via a crafted request.
Schneider Electric U.motion Builder 1.2.1 and prior
System Compromise: Remote attackers can gain control of vulnerable systems.
Currently we are unaware of any vendor supplied patch or updates available for this issue.