Abstract:

This document summarizes GitHub Issue #291 in the OpenBoardView repository, which tracks the request for supporting the proprietary Teboview (.tvw) file format. The core challenge revolves around the reverse-engineered specification held by a key developer, 'inflex,' who has integrated the decoder into their commercial software (FlexBV). Although the developer previously offered a bounty for an open-source solution, they ultimately invested their own resources and are now delaying the public release of the full file specification—citing a need to recoup costs—for an estimated 9–12 months. Users expressed strong interest in obtaining the specification immediately for implementation in the free and open-source OpenBoardView tool, but 'inflex' confirmed that currently available information is insufficient due to the format's complex, "obscure inferred indexing."

Teboview (tvw) format support request (GitHub Issue #291)

• (Start of Issue) Request for Support: Contributor swiftgeek opened the issue, requesting support for the Teboview (.tvw) file format in OpenBoardView (OBV), referencing external discussions on the difficulty of decoding the proprietary binary format.
• (inflex Comment) Decoding Progress and Constraints: Developer inflex confirmed they have been working on decoding the format incrementally (using tools like ImHex) but encountered difficulties. They achieved significant progress by comparing minimal layout variations and using official Teboview decoders in a virtual machine.
• (qwertychouskie Comment) Inquiring about Merge Status: A user noted that inflex had successfully progressed further (based on an external forum post) and asked when support would be merged into OBV.
• (inflex Comment) Proprietary Status and Delay: inflex clarified that their working decoder was implemented in their commercial product, FlexBV, not OBV. Key Takeaway: They explained that after a two-year open bounty failed, they developed the decoder themselves and must now withhold the full specification for 9–12 months to recoup their costs before releasing it to the open-source community for OBV implementation.
• (githubisnonfree Comment) Request for Existing Documentation: A user expressed opposition to using proprietary software (FlexBV) and asked if the partially released fileformat-tvw.txt in inflex’s related repository was sufficient for immediate OBV implementation.
• (inflex Comment) Insufficiency of Current Spec: inflex stated that the documentation provided on GitHub is not sufficient for decoding the format, noting the difficulty lies in "painful obscure inferred indexing" within the binary structure. They reaffirmed that a full, reliable spec would be released later.
• (inflex Action) Issue Status: The issue was briefly closed as "completed" but immediately reopened, acknowledging that while the format is decoded (in FlexBV), the goal of providing OBV support remains unfulfilled.