I use NTFS compression on some folders, I understand the pros and cons of this, but for my use case it is preferred.
I have noticed some odd behavior for many years. Some applications do not "honor" the directory compression flag.
I have never been able to determine why this is so. I'd like to understand the reasons and if there is any way to "force" and application to honor it.
Currently I just use a batch that runs compact from time to time on the required folders.