thanks for this link but this is about finding VMs which have a snapshot in general.
My question deals with finding a specific snapshot by searching for a keyword that is allocated to this specific snapshot.
It seems the library-search-function only works for snapshots that are active ("You are here").
Actually the article Gregg points you to is for vSphere/ESXi.
There is no such API for finding all snapshots in VMware Workstation.
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You could read all vmsd files and use grep for keywords