Once upon a time, about 4/5 years ago, I was given a corrupted Ms excel file by a desperate girl who had just lost months of work.
I tried anything to resurrect that file, even opening it with newer or older excel versions, changing random bytes in it (!), replacing parts of it from a good xls file.
None of it worked.
By that time, being a good guy :-), I already knew that Spreadsheet::ParseExcel and Spreadsheet::WriteExcel were on CPAN. Probably I could use those modules to try parsing the corrupted xls and writing it back to a new file.
That was what I did, and with a five lines perl script I saved that person's work.
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