hi .. i have 2 files one called (Zain) and one called (Petrol) and both are very from many ways,, once i open the file( Zain ) i found all the data of Petrol and when i open petrol i found the data of Zain ,, what i mean is the file names exchanged by it self , that happened about 3 times with different files ,
secondly : - once i open a file i found all the formats and the formulas gone by it self and the data still there ..

i use Excel 2007 but i used to save my files to open with 79 & 2003

is there a solutions for this problems ???