Program has been working. Windows7, Libreoffice folder in Programs.
Please try to detail a bit the question. The file must be in C:\Program Files\LibreOffice 5\program. If it is was deleted, I think the only way is reinstall.
Can be in C:\Program Files (x86)\LibreOffice 5\program for a 32bits version.
Let’s not forget Program Files (x86) is available only on 64-bit Window$, otherwise 32-bit ones are installed in the non-(x86) folder.