I used to modify this file for myself, including the connections within it, but it has been a long time. If I remember correctly, the connections are defined in the `` tag in files like 022000.(WindowMSButtonShared).xdb.
The first 3 digits in the xdb file seem to match the ID of the perks, except for the basic ones. For example, 148000.(WindowMSButtonShared).xdb has an ID of 148.
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