Files with es3 suffix seems to be nowadays mostly found as special digital signed documents prepared using the Hungarian e-Szigno software.

There is one other file type using
the ES3 file extension!

es3 file icon.es3 - Canon VIXIA HG21 high resolution exported movie

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ES3 file extension - e-Szigno signed document

What is es3 file? How to open es3 files?

File type specification:

Document file type icon Document file type

File extension es3 is associated with the e-Szingo, Hungarian on-line service, which allows users to create digital signs and digital certificates.

It looks like .es3 file contains digitally signed document from e-Szingo.

Help how to open ES3 files:

Use e-Szigno to view the content of .es3 documents.

How to convert file with extension ES3:

Export to other document formats or PDF is perhaps possible with the original tool.

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