GIMP 2.99.16: Esm Software PIX file open fails

Environment/Versions

• GIMP version:GIMP 2.99.16
• Package: Installer from gimp.org
• Operating System: Windows

Description of the bug

opening alias PIX files don't work

Reproduction

Is the bug reproducible? Always

Reproduction steps:

1. Go to https://telparia.com/fileFormatSamples/image/aliasPIX/
2. Try to open any file and see that GIMP gives error message it can't open the file