Lotus Worksheet File Format

Specifications

An official set of file format specifications were released by Lotus Corporation and released into the public domain.

The official dedication is in the first document:

The information contained in this document has been released into the public domain and is not considered to be confidential or proprietary although still the copyright and property of Lotus Development Corporation. All efforts have been made to ensure that this information is clear and useful since Lotus will not be providing customer assistance with this booklet.

• WSFF1.TXT covers the generic record structure and includes a summary of the core record types.
• WSFF2.TXT covers each record type, including wire layouts.
• WSFF3.TXT covers the cell format bit field
• WSFF4.TXT covers the wire layout of formula expressions
• WSFF5.TXT covers the formula opcodes (addendum to WSFF4)