It's a known issue, and It's a problem of the antivirus. In order to catch virus yet unknown, most antivirus programs use heuristic techniques to report a virus. This means that, instead of relying on proven information about a specific program, they just analyze behavioral patterns, like programs that defends against tampering or using cryptography.
The solution would be in this case to specify to ignore bglman.dll from scanning, or to turn off heuristic detection.