the pz2 files are just plain text, any text editor will open them. If the file is using other files there will be a readscript  line with a file name and path. A mat pose file should NOT be loading deltas or channel visibility because those are morph injections.

It looks like those poses are loading morphs and textures, which is OK .  It may be that your preferences are set to a shallow search path which will limit finding the referenced files.