If you find a file, look for published hashes. Compare using PowerShell:

is an abbreviation for a specific community group (like a "decoding" or "cracker" group) or a particular technical utility? This would help in tracking down a more specific "exclusive" story. Windows Binary Files - Download FaST-LMM - Microsoft

Searching for outdated, exclusive downloads exposes you to three major risks:

If you remember “wbtdec” from a forgotten forum or tool pack, please contribute to the public record – upload a sample to or GitHub with a clear description. Until then, assume it is either a typo, a hoax, or an abandoned project not worth the security risk.

Binary tools like wbtdec (2016) highlight the enduring need for low-level file analysis on Windows. However, the pursuit of “exclusive” downloads exposes users to legal and security risks. Responsible reverse engineering relies on verifiable, open-source, or properly licensed software—not secret builds from untrusted sources. If you need to decode a specific binary format, start by documenting its structure and seeking modern, community-vetted tools.