Use the File>Open menu command in ARCHICAD to open the IFC file.
Then it will convert it to an ARCHICAD Project File.
To check whether this IFC file is good, open it in a free IFC Viewer application such as Solibri Model Viewer:
https://www.solibri.com/products/solibri-model-viewer/
If Solibri opens it fine, but ARCHICAD doesn't, the problem is probably with ARCHICAD's IFC Import.
If even Solibri cannot open it, then the problem is with the IFC file itself, it is then probably not in the proper format. In that case the creator of the IFC file should be notified.
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