Do you have a folder called 'prj' in the same directory as the .qvw file?
If so, delete that folder. You will be able to open the file then with your PE version of QV. Somehow, QlikView automatically generates those folders, indicating it uses version control for the file. QVW files under version control, can only be opened with licensed versions of QlikView. By deleting the prj folder, you disable the version control for that file.
This is happening since That file was created by not a personal edition copy of qlikview
that is that was created with a full licenced version.
Now you opening it may be on another laptop/desktop with Personal edition so it will not open.
please note files created with Full licence can opened in other system with full qlikview licence.