Dear sister

searchh everything

Where was it?

Or she could just search the file name and be done with it

Sort folders by file size...unless he put random files in each subfolder as well.

*ahem* *cough cough* search bar *cough*

I would've done this, but his her file somewhere else. Also, I'd have set up loops in the sub folders.

Search would fix this right up, indexed or not. Even if the name was changed I doubt he added additional files. *.* that thing and it'll be the only result when searched from the parent

I would have encrypted every single file here.

Save the file on different pc/usb, delete the original file and watch her suffer

This would be easy

Plot twist he deleted it

just look which folder is the biggest!?

That's too kind. It would have been better replaced with 42.zip renamed as her file name.

Just check the size and the folder that actually has a size is the one with the project...

right click each folder and look for the one that's bigger