Solution:
htaccess
file with suffix name like -1516661360
is backup of your real .htaccess
file. It backuped from server side. You can see, when backup was done, if will convert 1516661360
UNIX epoch time to date.
If you’ll go to Dashboard -> Settings -> Permalinks
and click Save changes
, then wordpress will create new .htaccess
file for your permalinks structure, if it not exists.