What is the ROZ file format?
.roz is the native project file format for aSc TimeTables, a school timetabling application developed by aSc Applied Software Consultants s.r.o. in Slovakia. The extension derives from the Slovak word *rozvrh*, meaning 'timetable' or 'schedule'.
A single .roz file stores a complete timetable project: teacher and classroom lists, subjects, student groups, grade levels, period definitions, scheduling constraints, and the generated timetable assignments. The format is compressed and proprietary; files can only be opened by aSc TimeTables.
aSc TimeTables is actively maintained with annual releases - the current version is aSc TimeTables 2027 as of 2026. Files are generally compatible across consecutive release years. The format supports exchange between the desktop application and the EduPage online timetabling platform. On Windows, a companion launcher roz.exe is registered as the file-type handler, allowing .roz files to be opened directly.
Security & safety
RISK: LOWSchool scheduling data file; no executable code; no personal financial data. Low risk.
Format details
in a nutshellPrograms that open ROZ files
Windows1 app
Technical details
deep spec| Format type | Proprietary compressed timetabling project file |
| Encoding | Binary (compressed) |
| Compression | Applied (exact algorithm undisclosed; documented as a compressed format) |
| Typical file size | 50 KB - 5 MB |
| Content | Teachers, classrooms, subjects, student groups, periods, constraints, timetable assignments |
| Version compatibility | Generally forward-compatible across annual release versions |
| Cross-platform exchange | Transferable between aSc TimeTables desktop and EduPage online platform |
| Associated OS | Windows |
| File association handler | roz.exe (Windows file-type launcher) |
| Developer | aSc Applied Software Consultants s.r.o. (Slovakia) |
| Extension etymology | From Slovak rozvrh (meaning 'timetable' or 'schedule') |
| MIME type | application/octet-stream |
| Released | circa 1996-2000 (aSc TimeTables first versions) |
| Latest version | aSc TimeTables 2027 (current as of 2026) |
| Specification | help.asctimetables.com |
ROZ conversions
Community Q&A
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