The Microsoft Jet Database Engine is the underlying technology that powered Microsoft Access versions through Access 2003 (and data access components in older versions of Office). JetComp.exe was specifically designed for Jet 3.5 and Jet 4.0 databases.

jetcomp.exe /s C:\Source\Database.mdb /t C:\Target\Database.mdb /sync

If you are certain you have a legitimate copy (perhaps copied from an old, known-good Windows XP machine or an official Microsoft CD), here is how to use it safely.

✅ Download jetcomp.exe via XP Support Tools. ✅ Extract to a local folder. ✅ Backup your .mdb . ✅ Close all apps using the database. ✅ Run jetcomp.exe from Command Prompt. ✅ Test the compacted database before deleting the original.

Alternatives to jetcomp.exe for recovery