Encode history files with same encoding as original

[semsphy]

My file encoding is ISO-8859-15, when I was trying to compare the file I got this error below:

Traceback (most recent call last):
  File "/media/DataCenter/Apps/sublime_text_3_64/sublime_plugin.py", line 358, in on_query_completions
    res = callback.on_query_completions(v, prefix, locations)
  File "ctagsplugin in /media/DataCenter/Dropbox/sublime-text-3/Installed Packages/CTags.sublime-package", line 954, in on_query_completions
  File "./codecs.py", line 301, in decode
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xe9 in position 815: invalid continuation byte