Refer to the updated GDAL provider notes for 4.0 in regards to swapping the GDAL dll for one from gisinternals which has postgis raster support.
https://trac.osgeo.org/mapguide/wiki/MGOS40GdalProvider - Jackie You wrote: If I use MapGuide 4 Preview 3 Win10 x64, does it support the Postgis-Raster already ? Or do I still have to patch it with the new GDAL ? Could you share some instructions how to patch the MG 3.1.2 with the new GDAL? I’m not sure what exactly means replacing the DLL If I am going to access a Postgis Raster file, what source should I use, GDAL or Postgis? -- *Please Note: I no longer create new posts or post replies to any OSGeo mailing list through nabble. As a result, you most likely won't see this message appear on nabble's view of any OSGeo mailing list and may only see this message through mailing list archives or depending on your mailing list subscription settings, through daily message digests or automated notifications from the mailing lists.*
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