We have found one software suitable in our database for this conversion.
ter to exr conversion is most likely related to export of TerraGen files to OpenXKR image format. Terragen Supports EXR format, so such export should be doable.
Unfortunately, we have not found any specific information about such conversion or the use for it. If you are looking for some particular issue, maybe contact TerraGen support or community sites.
TER
Files with ter file extension might be found as landscape data files from TerraGen scenery generator.
EXR
An exr file extension is used for images stored in the OpenEXR Image Format that was developed by the Industrial Light & Magic. OpenEXR image format was going to public in 2003 and it is supported by popular graphics applications, such as Adobe Photoshop, Adobe After Effects, 3D Studio Max, Blender etc.