- AiM RaceStudio 3
- .xrk
.xrk · AiM RaceStudio 3
Open AiM .xrk and .xrz files without Race Studio 3
An AiM RaceStudio 3 .xrk file starts with the hCNF signature, and a .xrz is that same container wrapped in a zlib stream. It is structurally unrelated to .drk despite the shared vendor. Wild Telemetry opens it through libxrk, and its lap count matches Race Studio 3 exactly.
- Format at a glance
Format at a glance
| Extensions | .xrk and .xrz (zlib over .xrk) |
|---|---|
| Vendor | AiM (RaceStudio 3) |
| Magic | hCNF |
| Sample rates | Asynchronous, 1 Hz to about 526 Hz |
| Units | Declared per channel |
| Lap boundaries | Vendor markers, within 0.5 s of the CSV export |
| Lap-count parity | 11 / 13 / 16 / 2 across four verified files |
Why can the channels not simply be merged?
Channels in an .xrk are asynchronous: each has its own rate, from 1 Hz to roughly 526 Hz, and its own timecode list. Taking the union of every timecode produces a 1.35 million row by 100 column table, on the order of 1.1 GB for one of our fixtures, almost all of it padding.
Instead every channel is resampled onto the time base of the chosen speed channel. Vehicle speed is preferred over GPS speed, because GPS speed drops out and samples more slowly.
- The product
- FUJI
What you get when you open a session.
What it does not do
- Requires the optional libxrk package (MIT). Without it the app gives a clear error and points you at the CSV export route, rather than half-failing.
- Karts carry no throttle, brake or gear sensor. That is reported as what it is, missing sensors, and never zero-filled.
- The format is detected from CONTENT, not from the filename extension.
Have .xrk files?
Tell us which logger you run and we will say whether we can open your files before you install anything. Answered by hand.