What is A03 file?
A03 files are used to distribute the data for ARJ compressed files. The file extension is A03 and it is a very common type of file that contains the split multi-volume archive data. The contents of these files are described in the proceeding blog post which can be found from this link: https://www.fileformat.info/rest/assignments/A03/.
A03 Format details
|Split Multi-volume ARJ Compressed Format Archive (part 5)
|ARJ Software, Inc.
Software, that convert A03 files
The easiest way to convert a A03 file is to save it in a different file format using dedicated software. Below you will find a list of software programs that can handle A03 files. Open your A03 file with one of them and save in another file format.