Somebody sent you a folder of files with the same name and different extensions,
or a .gpkg you have never seen before. Drop it here and see what is in it: the
shapes, the column names at full length, the coordinate system it declares — and, plainly, what
the file does not say. Then take it away as KML, which Google Earth opens.
.zip · .gpkg · a bare .dbf or .shp
Nothing is stored. The file is read in memory to answer this page and is gone when the request ends — there is no account, no upload history and no copy of your data anywhere.
What this is not.
It is not a GIS, and it will not edit your data. It answers the question people actually have when a spatial file lands in their inbox: what is in this, and what do I do with it? If you need the table as a spreadsheet, or a Darwin Core archive, the main tool does that from the same file.