Earlier there was a post (https://sourceforge.net/p/sevenzip/discussion/45797/thread/67334954/) about very long paths in 7zip.
Although the examples in this page deal with compressing, I would think the same principles apply to extracting.
From what the article says, I would think I would build my command line like this:
&7z "x" "\\<ourServer>\glassfish\$Tier\$DeployShare\$FileName" "-o\\?\\\<ourServer>\glassfish\$Tier\$DeployShare\$ApplicationDirectory\"
I have tried this and several other derivatives, but have not come close yet to having a command that uses the "support for names longer than 260 characters" that I am seeing all over google. I am running this command inside powershell.
EDIT: I should add that this process is extracting a war file built by Grails. This is not just a compressed file that we manually compressed.
1) try 7-zip 9.32 alpha.
2) if it doesn't work also, try to find simplest command that doesn't work.