Preferred Executable Format — file signature 4A 6F 79 21 at offset 0

For Preferred Executable Format, hex signature is 4A 6F 79 21; offset is 0, verified against its source on 2026-09-22.

Hex signature: 4A 6F 79 21 verified
Offset: 0 verified
Format: Preferred Executable Format verified

Sourceen.wikipedia.org

Verified2026-09-22

Review by2027-09-22

DatasetFile format magic numbers

What the source says

4A 6F 79 21 | Joy! | 0 | | Preferred Executable Format |

— en.wikipedia.org, retrieved 2026-09-22

Source

en.wikipedia.orghttps://en.wikipedia.org/wiki/List_of_file_signatures

Last verified against source: 2026-09-22. Due for re-check by 2027-09-22. This page as Markdown · OKF bundle · full dataset as JSON.