ID; in the first 3 characters of a file is the signature for a SYLK file. The fourth character can be a P, N or an E which flags certain information about how the rest of the file should be processed.
Remember not to use ID as the first column name of a CSV file when using semicolons as field delimiters. I spent too long debugging a problem with CSV file creation when the problem was the first column name.
January 3, 2012
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