thanks for your suggestions but this solution doesnt seem to work on text files.
So, if I open a text file in excel, it still changes cell values, i.e. skips leading zeroes.
Any more workarounds? ;) Or will someone FINALLY make a spreadsheet program where you can turn off all auto-whatever features. OO-Calc seems to be a perfect clone of excel, including all bugs and nuisances, so there is no point in changing, ditto for Gnumeric,....
All the best