diff --git a/build/Gruntfile.js b/build/Gruntfile.js
index 4116d502f..2412ba4cc 100644
--- a/build/Gruntfile.js
+++ b/build/Gruntfile.js
@@ -12,52 +12,64 @@ module.exports = function(grunt) {
                     ' * Version: <%= pkg.version %> (build:<%= pkg.build %>)\n' +
                     ' */\n';
 
+    let iconv_lite, encoding = process.env.SYSTEM_ENCODING || 'win1251';
+    if (process.platform == 'win32') {
+        const cmdencoding = require('child_process').execSync('chcp');
+        if ( cmdencoding.includes('866') ) {
+            iconv_lite = require('iconv-lite');
+        }
+    }
+
+    let _encode = (string) => {
+        return !!string && !!iconv_lite ? iconv_lite.encode(string,encoding) : string;
+    };
+
     var jsreplacements = [
                 {
                     from: /\{\{SUPPORT_EMAIL\}\}/g,
-                    to: process.env['SUPPORT_EMAIL'] || 'support@onlyoffice.com'
+                    to: _encode(process.env.SUPPORT_EMAIL) || 'support@onlyoffice.com'
                 },{
                     from: /\{\{SUPPORT_URL\}\}/g,
-                    to: process.env['SUPPORT_URL'] || 'https://support.onlyoffice.com'
+                    to: _encode(process.env.SUPPORT_URL) || 'https://support.onlyoffice.com'
                 },{
                     from: /\{\{SALES_EMAIL\}\}/g,
-                    to: process.env['SALES_EMAIL'] || 'sales@onlyoffice.com'
+                    to: _encode(process.env.SALES_EMAIL) || 'sales@onlyoffice.com'
                 },{
                     from: /\{\{PUBLISHER_URL\}\}/g,
-                    to: process.env['PUBLISHER_URL'] || 'https://www.onlyoffice.com'
+                    to: _encode(process.env.PUBLISHER_URL) || 'https://www.onlyoffice.com'
                 },{
                     from: /\{\{PUBLISHER_PHONE\}\}/,
                     to: process.env['PUBLISHER_PHONE'] || '+371 633-99867'
                 },{
                     from: /\{\{PUBLISHER_NAME\}\}/g,
-                    to: process.env['PUBLISHER_NAME'] || 'Ascensio System SIA'
+                    to: _encode(process.env.PUBLISHER_NAME) || 'Ascensio System SIA'
                 },{
                     from: /\{\{PUBLISHER_ADDRESS\}\}/,
-                    to: process.env['PUBLISHER_ADDRESS'] || '20A-12 Ernesta Birznieka-Upisha street, Riga, Latvia, EU, LV-1050'
+                    to: _encode(process.env.PUBLISHER_ADDRESS) || '20A-12 Ernesta Birznieka-Upisha street, Riga, Latvia, EU, LV-1050'
                 },{
                     from: /\{\{API_URL_EDITING_CALLBACK\}\}/,
-                    to: process.env['API_URL_EDITING_CALLBACK'] || 'https://api.onlyoffice.com/editors/callback'
+                    to: _encode(process.env.API_URL_EDITING_CALLBACK) || 'https://api.onlyoffice.com/editors/callback'
                 },{
                     from: /\{\{COMPANY_NAME\}\}/g,
-                    to: process.env['COMPANY_NAME'] || 'ONLYOFFICE'
+                    to: _encode(process.env.COMPANY_NAME) || 'ONLYOFFICE'
                 }, {
                     from: /\{\{APP_TITLE_TEXT\}\}/g,
-                    to: process.env['APP_TITLE_TEXT'] || 'ONLYOFFICE'
+                    to: _encode(process.env.APP_TITLE_TEXT) || 'ONLYOFFICE'
                 }, {
                     from: /\{\{HELP_URL\}\}/g,
-                    to: process.env['HELP_URL'] || 'https://helpcenter.onlyoffice.com'
+                    to: _encode(process.env.HELP_URL) || 'https://helpcenter.onlyoffice.com'
                 }];
 
     var helpreplacements = [
                 {
                     from: /\{\{COEDITING_DESKTOP\}\}/g,
-                    to: process.env['COEDITING_DESKTOP'] || 'Подключиться к облаку'
+                    to: _encode(process.env.COEDITING_DESKTOP) || 'Подключиться к облаку'
                 },{
                     from: /\{\{PLUGIN_LINK\}\}/g,
-                    to: process.env['PLUGIN_LINK'] || 'https://api.onlyoffice.com/plugin/basic'
+                    to: _encode(process.env.PLUGIN_LINK) || 'https://api.onlyoffice.com/plugin/basic'
                 },{
                     from: /\{\{PLUGIN_LINK_MACROS\}\}/g,
-                    to: process.env['PLUGIN_LINK_MACROS'] || 'https://api.onlyoffice.com/plugin/macros'
+                    to: _encode(process.env.PLUGIN_LINK_MACROS) || 'https://api.onlyoffice.com/plugin/macros'
                 }];
 
     let path = require('path');
diff --git a/build/package.json b/build/package.json
index 2bedad73d..9bc5783e0 100644
--- a/build/package.json
+++ b/build/package.json
@@ -22,6 +22,7 @@
     "grunt-svgmin": "^6.0.0",
     "grunt-text-replace": "0.3.11",
     "iconsprite": "file:sprites",
+    "iconv": "^2.3.5",
     "less-plugin-clean-css": "1.5.0",
     "lodash": "^4.0.0",
     "mocha": "^6.2.2",