Windows - set permissions

MOPAC2016 needs to be able to read and write files in the folder that holds the file MOPAC2016.exe.  Normally, this folder is "C:\Program Files\MOPAC"  In Windows this folder is write-protected by default, so MOPAC2016 will not be able to write the password file. Before MOPAC2016 can write its own password file, the permissions on the folder must be changed.  To do this, use the following instructions:

How to set permissions on the MOPAC folder

If MOPAC2016.exe is put in a different folder, then the Environmental Variable must be set, and the folder must have permission for "Users" to write to the folder.