It's legit. Question: If it was a trojan, how the heck would it infect your computer? You can't run it, you have no need to open it, all that needs to happen is for it to be moved to the SD card. If you're really paranoid, just use HBAS so the binary never even touches your computer.
Also, here's VirusTotal on the binary and the entire 7z.
If you're talking about the emulator that I made, it has no trojans in it. It's a legit GameBoy emulator for the Wii U, although admittedly a bad one as of now, the compatibility isn't close to 100% and sound doesn't work. It's being improved and will be renamed when the improvements are added.