good afernoon, I have a problem that is when I open a excell file created in
a accounting program it doesn´t allow me to make any calculation for
instance, I would like to make a somatory from some cells but the only result
tha I obtain is 0, I don´t understand why because the values are well
formatted, everything should work fine but it doesn´t, can anyone help me
please?

My version of office is 2003 and the program from I created the excell file
is PMR, a Portuguese accounting program.

Thanks in advance.