How to change the encoding in wpallimport in wordpress and set up automatic product updates?

Question

WordPress

There is wpallimport pro on worpdress. One site provides an automated link to the csv file so that products through this link plugin are automatically updated. The plugin has such a function and everything works, except that the encoding of the Windows csv file is 1251 and wpallimport displays the data incorrectly. Tell me, please, what can you think of? Is it possible to change the encoding by reference using the code written in the plugin itself? Maybe this is possible at all. Or some service to which you can upload this link, a table with the correct utf-8 encoding will be automatically loaded there and give a link. Or are these all fairy tales and you will have to manually change the encoding through notepad ++ and you will have to forget about automatic product updates?