KB ID 0000920
I needed to do a quick network diagram for a client, as as soon I tried to open some networking stencils, this happened;
You are attempting to open a file type (Visio 2000-2002 Binary Drawings, Templates and Stencils) that has been blocked by your File Block settings in the Trust Center.
Click the File tab. Click Options. Click Trust Center, and then click Trust Center Settings. In the Trust Center, click File Block Settings.
Microsoft does love a ‘double negative’, to get your files to open Files > Options > Trust Center > Trust Center Settings > File Block Settings. Now the default policy is block, so to make them work you need to UNTICK them!
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