Using our Win10-AllDrivers VM, download and install OpenOffice . Download unoconv zip, and extract it to c:\unoconv https://github.com/dagwieers/unoconv/archive/master.zip Rename the unoconv file to unoconv.py Download and install ghostscript I suggest: c:\gs https://github.com/ArtifexSoftware/ghostpdl-downloads/releases/download/gs919/gs919w32.exe Create a unoconv.bat file, add the content below and save it on c:\unoconv echo off REM unoconv.bat cd "C:\unoconv" "c:\Program Files\LibreOffice 5\program\python-core-3.3.0\bin\python.exe" unoconv.py %* That VM already has integration branch on c:\xampp\htdocs\integration , update and upgrade it. Log in as admin. Go to Site administration ► Server ► System paths Set pathtogs setting to your ghostscript installation binary, if you followed my suggestion C:\gs\bin\gswin32.exe Set pathtounoconv setting to your unoconv folder, if you followed my suggestion c:\unoconv\unoconv.bat Create a course and few users and enrol them. Create few docs using the open office and submit them (can be as admin). Go to the new assignment grade page. It should convert the doc file and display correctly. You should be able to add marks and comments on the pdf. Switch to another user on the assignment interface. It should generate the file correctly and you should be able to add marks and comments on the file.