My mistake, thanks for the incidental clarification. I intended to say "archive". Point being the same, IIRC MiXplorer does have some capability to create or modify the content of apks. If that is incorrect then I stand corrected, but if that is correct then there is some merit to this user's report.
Moot as I intended to say "archive", although that distinction betwen APKs and other archives may be part of an unavoidable but as yet unexplained limitation - the very explanation I seek.
No one has as yet stated a specific reason why MiXplorer cannot handle that particular file while it can handle the same action on other files. Maybe there is such a reason, in which case I seek to know that reason, and if there is no reason then it might be something HP can work with.
Disclaimer: this is not to disagree with the recommendation to use a dedicated APK utility for managing APK files, but in the absence of a specific reason why that file did not work in MiXplorer, this seems like a reasonable request for MiXplorer development. Both of these things can be true at the same time.