I can't answer this question, because I'm not the developer of hashcat-utils, to which cap2hccapx belongs.
For me, the ancient binary format hccapx/hccap with all its disadvantages is dead. There will be no more hccapx/hccap related updates or improvements of hcxtools, because the effort to handle PMKIDs and EAPOL MESSAGEPAIRs from different hash files is far too much.
BTW:
If you need a more portable and Windows friendly version of a converter:
https://github.com/s77rt/multicapconverter
For me, the ancient binary format hccapx/hccap with all its disadvantages is dead. There will be no more hccapx/hccap related updates or improvements of hcxtools, because the effort to handle PMKIDs and EAPOL MESSAGEPAIRs from different hash files is far too much.
BTW:
If you need a more portable and Windows friendly version of a converter:
https://github.com/s77rt/multicapconverter