You can simply repack ARJ archives to Z-zip when you extract the original *.arj file with 7-zip program and create a new 7-z archive from the data.
Convert ARJ Compressed archive to 7z compressed archive file.
We found one software available in the database for this conversion.
Microsoft Windows software - convert arj to 7-z on Windows
Popular open source file archiver with a high compression ratio
Convert from arj file format
|Yes, 7-zip supports 7-z file conversion as a target file type.||Yes||Yes||7-z editor||Yes||No||No||Yes|
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.