Got it,
I think that the file is not able to process spaces in the function. The directory structure of windows machines is "C:\Program Files\..." but your preprocessor gives output that it does not recognize "C:\Program" as an internal or external command, operable program or batch file.
I believe you are using the MinGW-w64 compiler and that does not support spaces in its path. For more info, refer to MATLAB documentation -- https://www.mathworks.com/help/matlab/matlab_external/install-mingw-support-package.html
You can reinstall the MinGW compiler using C:\mingw-64 as the root directory. Then, your loadlibrary function should work fine.
