I have the Apple App Store version on The Archive Browser 1.11.1 and I uncompressed large multi-part movies using RAR format. This one worked but if it has another instance of the Archive Browser open with a loaded file it fails with a dark red screen: Could not extract the file "XYZ" from the archive "(null)":

See the attached screenshot

This has happened with just one instance open if it has over 100 parts.