If one has to write a program to check if a user did not screw up cut and paste from one sheet/column/whatever it would be IMHO easier to just skip Excel, user

If one has to write a program to check if a user did not screw up cut and paste from one sheet/column/whatever it would be IMHO easier to just skip Excel, user and just write a script automating error prone C&P in Excel. If some user wants to view it, then the script can create a valid Excel file.