Omnis Quartz segment 5 data file
File type: Database file
A QD5 file contains the fifth segment of database data used by Omnis Quartz, an early graphical database for Microsoft Windows. It is a component of an Omnis Quartz database rather than a complete database file on its own.
File type category:
Database file
Date updated: September 28, 2026
Omnis Quartz was one of the early GUI database products for Microsoft Windows. The .qd5 file extension identifies the fifth segment of its database data.
The QD5 file belongs with the other files that make up the same Omnis Quartz database. The latest product in this software family is Omnis Studio, which is available for Microsoft Windows and is associated with this legacy database format.
Do not open a QD5 file as an independent document. Keep it with the other files from the same Omnis Quartz database and open the database with compatible Omnis software.
On Microsoft Windows, Omnis Studio is the associated application to try. Compatibility with a particular legacy database may depend on the version and on whether all of the database files are present.
A QD5 file contains only one segment of an Omnis Quartz database, so it should not be converted or renamed independently of the rest of the database.
If compatible Omnis software can open the complete legacy database, export or copy the database contents from that software into a format it supports. The resulting export contains the data, not necessarily the original QD5 segment structure.
Software applications that handle other tasks involving qd5 files:
Microsoft Windows
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