You could try making a couple of small changes to bookmark.e.
It seems to work.
In updateBookmarksToolWindowOne()
caption := LineData"\t"BookmarkName"\t"Filename"\t"Pathname"\t"RealLineNumber;
and this
void ctl_bookmarks_tree.on_create()
{
TBBOOKMARKS_FORM_INFO info;
info.m_form_wid=p_active_form;
gtbBookmarksFormList:[p_active_form]=info;
ctl_bookmarks_tree._TreeSetColButtonInfo(1,1000,TREE_BUTTON_PUSHBUTTON|TREE_BUTTON_SORT_COLUMN_ONLY|TREE_BUTTON_SORT,0,"Name");
ctl_bookmarks_tree._TreeSetColButtonInfo(2,1000,TREE_BUTTON_PUSHBUTTON|TREE_BUTTON_SORT_COLUMN_ONLY|TREE_BUTTON_SORT|TREE_BUTTON_SORT_FILENAME|TREE_BUTTON_IS_FILENAME,0,"File");
ctl_bookmarks_tree._TreeSetColButtonInfo(3,1000,TREE_BUTTON_PUSHBUTTON|TREE_BUTTON_SORT_COLUMN_ONLY|TREE_BUTTON_SORT|TREE_BUTTON_SORT_FILENAME|TREE_BUTTON_IS_FILENAME,0,"Path");
ctl_bookmarks_tree._TreeSetColButtonInfo(4,500, TREE_BUTTON_PUSHBUTTON|TREE_BUTTON_SORT_COLUMN_ONLY|TREE_BUTTON_SORT|TREE_BUTTON_SORT_NUMBERS,0,"Line");
ctl_bookmarks_tree._TreeSetColButtonInfo(0,1000,TREE_BUTTON_PUSHBUTTON|TREE_BUTTON_SORT_COLUMN_ONLY|TREE_BUTTON_SORT|TREE_BUTTON_AUTOSIZE,0,"Text");
updateBookmarksToolWindowOne();
ctl_bookmarks_tree._TreeTop();
}