Perhaps not strictly on-topic, but is there any equivalent FS/program in Windows that will allow users to have read-only access to files that are deduplicated in some way?

My use case is the MAME console archives, which are now full of copies of games from different localisations with 99% identical content. 7Z will compress them together and deduplicate, but breaks once the archive exceeds a few gigs.

These archives are already compressed (CHD format, which is 7Z + FLAC for ISOs), but it's deduplication that needs to happen on top of these already compressed files that I'm struggling with.

Sorry for the off-topic ask!