A file is nothing more than a very long string. 🙂 Most likely you want your tables to be ASCII formatted strings (elements sperated by a delimiter characters and rows separeated by a newline character) so they are humanly readable.
Use array to spreadsheet string twice. Once for the array of strings and once for the DBLs. Select the desired delimiter and formats and just concatenate the two strings at the end before writing the string to a file.
(Of course of you later want to read it again into LabVIEW, you need some logic to determine where the numbers end and the hex strings begin, etc.)