Given the verifiable information that is available to you, it is highly unlikely that the executable program emailed by the IDEAFARM.COM servers to you is malicious.
Before opening it, you can easily have Windows Defender scan the ".exe" file by putting it alone in a folder and having Defender scan all files in that folder. Defender will not report any problems with the file. This will tell you that either the file is not malicious or its maliciousness is concealed cleverly enough to fool Defender. When asked, "How difficult is it to create a malicious executable that Windows Defender will not detect?", an AI responded, in part, "While a developer can easily create a file that passes an initial scan today, maintaining its undetected status is incredibly difficult. Once a new evasion technique is used in the wild, Microsoft's automated telemetry quickly catches the behavior, updates the cloud-based machine learning models, and pushes an update to millions of Windows devices worldwide, often within hours. This requires malware authors to constantly rewrite and re-engineer their code to stay ahead." Before opening the ".exe" file, you can easily recalculate its "hash value" and verify that it matches a value listed on a page at IDEAFARM.COM. With the information on this page and information available on the Internet, you can easily verify the following "stylized facts":