Harvard Graphics device driver file
File type: Various data file
Files with the .ex3 file extension are used by Harvard Graphics ChartXL. They contain device-driver data used by the software.
File type category:
Various data file
Date updated: October 30, 2026
The .ex3 file extension is associated with Harvard Graphics presentation and charting software. An EX3 file stores a device driver that enables the software to work with a supported output device.
Harvard Graphics was acquired by Serif Ltd. in 2001. EX3 is a legacy format associated with the Windows version of Harvard Graphics ChartXL.
Use Harvard Graphics ChartXL on Microsoft Windows to use an EX3 file. These files are device drivers rather than ordinary documents, so they are normally loaded by the software when needed and are not opened as standalone files.
An EX3 device-driver file is not normally converted to another format. If a chart or presentation must be exported, open the associated work in Harvard Graphics ChartXL and use the software's available output or export functions; the driver file itself generally has no useful conversion target.
Software applications that handle other tasks involving ex3 files:
Microsoft Windows
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