Pretty sure I muscle memory that
1 Left Click Property.
2 Hit "W" on Keyboard
Should trigger that "Weight map"
Also muscle memory for many other shortcut keys...
This should be a Generic Windows feature from the start of windows, right?
e.g. right click any file, and hit C for "Copy" D for "Delete " etc...
Sorry I can not recall whether It is previously working or not, since I am not often using Softimage on Win 10...