Hey Karl
I think it may be worth discussing this concept, as functionality has certainly changed over the years. Maybe you or anyone else may be willing to confirm the following or offer alternatives:
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As far as I can tell on my Windows XP SP3, the ArchiCAD preview will only appear in Windows Explorer if you have the 'View' set to Thumbnails. Any other view option will still show the icon.
Also, if 'Show common tasks in folders' is enabled via Tools>Folder Options>General, then Windows Explorer will show the preview under the Details section.
The ArchiCAD preview will also be available via the file's Properties.
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On my Windows Vista Business Edition, the ArchiCAD preview becomes visible in Windows Explorer when the 'View' is set to Medium, Large, or Extra Large Icons, or Tiles. And the icon appears if the view is set to Small Icons, List or Details.
In any case I personally always recommend that file extensions are shown in all Windows folders, which in turn enables them inside ArchiCAD.
In ArchiCAD 12's Open dialog itself, (in Vista or XP) we can use the same 'View' options as in Windows Explorer, but we can also enable the 'Preview' option from the top right hand corner to show the ArchiCAD preview in a pane of it's own.
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On my Mac OS 10.4.11 (I'll update soon I promise!), unless I am missing something obvious, the ArchiCAD preview doesn't show in Finder at all. Not even in the 'Info' window?
In ArchiCAD 12's Open dialog, if the view option is set to 'Columns', then the preview will appear in the right hand pane, once the file is selected.
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Given all that I wonder if a simple change of 'View' would still allow the use of the ArchiCAD preview?
Cheers,
Link.