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[.exe | tested for 64-bit | version 1.1 | updated October 25, 2022]
WARNING: Thumbnail Generator is a primitive, lightweight VB.NET application which is lacking a digital signature, and as such, it will often fail to launch due to Windows SmartScreen.
Furthermore, it can sometimes be wrongly quarantined by some aggressive anti-viruses. These are false-positives, and Thumbnail Generator can also be restored safely.
This is how you can bypass Smart Screen and use the program: