# \#file-analysis

**URL:** https://community.tunersguild.com/tag/file-analysis/49.md

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## [How to Check if a Purchased Stage 1 File Is Safe: What to Look for in WinOLS](https://community.tunersguild.com/t/how-to-check-if-a-purchased-stage-1-file-is-safe-what-to-look-for-in-winols/51)

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**Author:** [@ThomasPirowski](https://community.tunersguild.com/u/ThomasPirowski)\
**Replies:** 0\
**Last updated:** [February 27, 2026, 1:10pm UTC](https://community.tunersguild.com/t/how-to-check-if-a-purchased-stage-1-file-is-safe-what-to-look-for-in-winols/51 "2026-02-27T13:10:00Z")

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Without opening the file: Did the seller provide a data sheet? Lambda logs? A dyno graph with AFR? Opening the file in WinOLS: Compare against stock. Check: rail pressure, SOI, smoke limiter, quantity maps, torque limit…