Are there any dollar amount limits associated with the TXF file?

Yes. Again, while IB imposes no limits, TurboTax has a 9-digit limit in data entry fields; when exceeding that limit, you'll receive a message similar to “The value is too large for this field.”

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Is the .TXF file compatible with both the Windows and Mac operating systems?
Is the .TXF file provided for all IBKR account types?
Does IBKR support the export of the Worksheet for Form 8949 in any other format?
Is there a transaction limit for TXF import?