A Microsoft file hosting and synchronization service.
You have to provide correct path to it.
Standard location for onedrive.exe on Windows 11 - %userprofile%\AppData\Local\Microsoft\OneDrive
You can use DIR to check if the file is indeed there.
If for some reason onedrive.exe is not there - search for one of my previous messages in this thread where I explained how to figure it out for any particular Windows installation (detailed step-by-step instructions with screenshots).
Here is the batch file I'm using to manually sync OneDrive folders on my rig:
cd %userprofile%\AppData\Local\Microsoft\OneDrive
OneDrive.exe /shutdown
OneDrive.exe /background