Don't show warnings but do store log, Max

[klaasnienhuis]

I'm having an issue with the fbx/dae exporter. It doesn't store the log/warning messages correctly. This means I can't present these mostly useful messages to my users.

When the fbx/dae exporter runs into problems it will log these to a file. When exporting manually the messages will normally be shown in a messagebox and additionally stored in a log file. However, when using the #noprompt flag, the warnings aren't shown (that's ok) but also aren't stored (bad).
The following example should store a log with warnings, but it doesn't. To trigger a warning, make a sphere and add a physique modifier to it.

FBXExporterSetParam "ShowWarnings" false
FBXExporterSetParam "GenerateLog" true
exportfile @"C:\test\test.fbx" #noprompt using:fbxexp

The showwarnings and generatelog properties are also available with the manual export. The logs are stored in my case here: C:\Users\klaas\Documents\3dsMax\FBX\3dsMax2014_X64 \Logs (windows 7).
Does anyone know how to coerce max to store the logs like it should?