download the updated file, i was trying the project luncher export but it given me some trouble or just me not so good at using it,
if you download it again you will find just the game file
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you must open the first file you find in the archive/folder, the file is the .exe
i downloaded the file too and there isn't a project file, if it still open the file TPOTF.exe with unreal engine you should find a way to reset the program windows use to open it but as it is an executable it hasn't sense that it opens it as a project