Visio will not open saved Visio files

[Microsoft Windows]

I moved to W11 and bought a new (standalone) version of Visio Professional 2021Creating saving and opening works fine for all new documents in Visio.However when I try to open any of my older Visio documents I get the following message on screen:After checking on Microsoft Support, I followed advice to allow open & save of 2003-2010 docs. AS you can see this is enabled.But it still gives same error.Can you help ? .... lots of documents I need access to

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