This is an AppleScript that removes from a text selection in World all text that has a single-strikethrough.
tell application "Microsoft Word"
activate
-- replace strikethrough text
set findRange to find object of selection
tell findRange
clear formatting
clear formatting replacement of it
set strike through of font object to true
execute find find text "" replace with "" replace replace all
set strike through of font object to false
end tell
end tell