.wsxz package can't be opened in Studio 2017 - does not see under "All supported packages"

Client sent me .wsxz package. 

 

I work with Studio 2017 all SPs installed. 

Wanted to Open Package > look for the file but on the file location Studio does not see the project package. 

Still invisible when "All supported packages" is selected. 

Anyone any idea? 

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