Data file
What is a .qst file?
A .qst file is a QuadriSpace Format. This is a data file — structured information used by a program rather than read directly. Confusingly, this extension has been used by 2 different formats over the years — they're all listed below.
This extension has been used by more than one format
2 different formats have claimed .qst over the years, so two files with the same extension aren't necessarily the same kind of thing.
How to open a .qst file
- Start with the program that produced it; that's almost always the right tool.
- Open it in a text editor to see whether it's readable text or binary.
- For database formats, DB Browser for SQLite or LibreOffice Base can often import it.
The registry records this extension against QuadriSpace Format, Quicken 3 Database File, so software from that family is the most likely match.
How to convert a .qst file
- If you can view the data, exporting to .csv is usually the most portable option.
The technical record
For archivists, developers and the merely curious: these are the PRONOM registry entries for .qst.
| Format name | Version | MIME type | PUID |
|---|---|---|---|
| QuadriSpace Format | — | — | fmt/888 |
| Quicken 3 Database File | 3 | — | fmt/1861 |