Star Office, Kword, Abiword, Kspread
These are all word/spreadsheet programs which can read and save microsoft file formats. You dont need to make a program because they already exist, and Linux doesn't need to convert a windows file into something else to be able to read it (unless it is an executable or file designed for windows to run a program - in which case you may be able to use wine, a windows api emulator).
BTW I dont think that Linux support Active X in programs, but may in web browsers. Not too sure.
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