How to detect the occasion on which my file format plugin has been called

Howdi!
I got following problem. I've implemented a file filter plugin, which merely overrides the native psd fileformat reads the psd structure and acts on it. Additionally I need the user to provide some additional information during this process, but only during a file read triggered by an actual open event. Now to the problem: When opening the file chooser and selecting a psd (even without opening it, just selecting it) my fileformat plugin gets invocation.
Is there a way to distinguish the context of invocation of my plugin? I reckon there is a preview flag in the data structure passed to the file format plugin, but this one is always set to false regardlass of the context.
Any ideas?
Regards,
Mike

Hi thanks for the advice, but I don't even have this types registered. Here's my list:
EnableInfo { "true" },
FmtFileType { '8BPS', '8BIM' },
FilteredTypes { { '8BPS', '8BIM' } },
FilteredExtensions { { 'PSD ' } },
Is there maybe anything else I can do detect if I'm not called during document open?

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