I am new to QGIS and I am trying to import more than 700 xyz (it is the same as ASCII?) files into the map so I can get a digital elevation model and then get the average elevation for some small polygons. I can simply import individual xyz file but importing more at once doesn't work for me?

I would like to make something such as a virtual raster catalog but I get:

Warning 6: gdalbuildvrt does not support positive NS resolution.

My files look like this: (they have no headers)

383000.0  97000.0   83.30
383005.0  97000.0   82.80
383010.0  97000.0   82.70...

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