diff --git a/.github/workflows/compile.yml b/.github/workflows/compile.yml
new file mode 100644
index 00000000..ad240279
--- /dev/null
+++ b/.github/workflows/compile.yml
@@ -0,0 +1,29 @@
+---
+name: Compile
+
+on:
+  pull_request:
+    paths:
+      - '**/*.mq?'
+      - '.github/workflows/compile.yml'
+      - '.github/workflows/scripts/compile.ps1'
+  push:
+    branches:
+      - 'master'
+      - 'ci'
+      - '*dev*'
+    paths:
+      - '**/*.mq?'
+      - '.github/workflows/compile.yml'
+      - '.github/workflows/scripts/compile.ps1'
+
+jobs:
+  Compile:
+    runs-on: windows-2019
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          submodules: 'recursive'
+      - name: Compile
+        run: .\.github\workflows\scripts\compile.ps1
+        shell: powershell
diff --git a/.github/workflows/scripts/compile.ps1 b/.github/workflows/scripts/compile.ps1
new file mode 100644
index 00000000..2df5c94a
--- /dev/null
+++ b/.github/workflows/scripts/compile.ps1
@@ -0,0 +1,10 @@
+Set-ExecutionPolicy RemoteSigned -scope CurrentUser
+Invoke-Expression (New-Object System.Net.WebClient).DownloadString('https://get.scoop.sh')
+scoop update
+scoop install ruby python
+Invoke-WebRequest -Uri https://github.com/EA31337/MetaEditor/raw/master/metaeditor64.exe -OutFile metaeditor64.exe
+./metaeditor64.exe /s /compile:. /log:mql.log
+# ruby -e "if File.open('mql.log', mode:'rb:BOM|UTF-16LE').readlines.grep(Regexp.new '[1-9] error'.encode(Encoding::UTF_16LE)) {exit 1}; end"
+# ruby -e "if File.open('mql.log', mode:'rb:BOM|UTF-16LE').readlines.grep(Regexp.new '[1-9] warning'.encode(Encoding::UTF_16LE)) {exit 1}; end"
+# ruby -e "if File.open('mql.log', mode:'rb:BOM|UTF-16LE').readlines.grep(Regexp.new '[1-9][0-9] error'.encode(Encoding::UTF_16LE)) {exit 1}; end"
+# ruby -e "if File.open('mql.log', mode:'rb:BOM|UTF-16LE').readlines.grep(Regexp.new '[1-9][0-9] warning'.encode(Encoding::UTF_16LE)) {exit 1}; end"
diff --git a/scripts/.funcs.cmds.inc.sh b/scripts/.funcs.cmds.inc.sh
index f5300fc6..4c2ddae5 100644
--- a/scripts/.funcs.cmds.inc.sh
+++ b/scripts/.funcs.cmds.inc.sh
@@ -195,7 +195,7 @@ install_mt() {
   4.0.0.* | 5.0.0.*)
     [ ! -d "$dir_dest" ] && mkdir $VFLAG -p "$dir_dest"
     [ ! -w "$dir_dest" ] && {
-      echo "Error: Destination folder not writable!" >&2
+      echo "ERROR: Destination folder not writable!"
       (id && stat "$dir_dest") >&2
       exit 1
     }
diff --git a/scripts/options.txt b/scripts/options.txt
index 04f8a944..bfd598d7 100644
--- a/scripts/options.txt
+++ b/scripts/options.txt
@@ -44,7 +44,7 @@ Supported options:
     Change tester INI file with custom settings (e.g. Server=MetaQuotes-Demo,Login=123).
     Variable (string): TEST_OPTS
   -j
-    Convert test report file into JSON format.
+    Converts test report file to JSON formatted file.
     Variable (bool): OPT_FORMAT_JSON
   -l (double)
     Specifies a lot step (e.g. 0.01).
@@ -80,7 +80,7 @@ Supported options:
     Spread to test in points.
     Variable (uint): BT_SPREAD
   -t
-    Convert test report file into brief text format.
+    Converts test report file to brief text format.
     Variable (bool): OPT_FORMAT_BRIEF
   -T (timeframe)
     Timeframe (TestPeriod) to test. Default: M30
diff --git a/scripts/py/bt_data_dl.py b/scripts/py/bt_data_dl.py
index a8848c07..b4306154 100755
--- a/scripts/py/bt_data_dl.py
+++ b/scripts/py/bt_data_dl.py
@@ -364,8 +364,8 @@ def bt5_to_csv(self):
             timestamp = "%d.%02d.%02d %02d:%02d:%06.3f" % (self.year, self.month, self.day, self.hour, minute, second)
             askPrice = row[1]/point
             bidPrice = row[2]/point
-            bidVolume = round(row[3] * 1000000)
-            askVolume = round(row[4] * 1000000)
+            bidVolume = "%.2f" % (row[4])
+            askVolume = "%.2f" % (row[3])
 
             # Writing one row in CSV format
             w.writerow([timestamp, bidPrice, askPrice, bidVolume, askVolume])
diff --git a/scripts/run_backtest.sh b/scripts/run_backtest.sh
index 1df57d9d..ddb0a79f 100755
--- a/scripts/run_backtest.sh
+++ b/scripts/run_backtest.sh
@@ -115,7 +115,7 @@ parse_results() {
   if [ -n "$OPT_OPTIMIZATION" ]; then
     # Parse and save the optimization test results.
     echo "INFO: Sorting optimization test results..."
-    if [ "${MT_VER%%.*}" -ne 5 ]; then
+    if [ "${MT_VER:0:1}" = 4 ]; then
       sort_opt_results "$TEST_REPORT_HTM"
     fi
     echo "INFO: Saving optimization results..."
@@ -476,8 +476,8 @@ if [ -n "$SETFILE" -a ! -s "$SETFILE" ]; then
   }
   cp -f $VFLAG "$TESTER_DIR/$exported_setfile" "$SETFILE"
 fi
-if [ -s "$SETFILE" -a ! -f "$TESTER_DIR/$EA_SETFILE" ]; then
-  echo "INFO: EA's SET file is missing ($EA_SETFILE), copying from $SETFILE..."
+if [ -r "$SETFILE" ] && ! diff -u "$TESTER_DIR/$EA_SETFILE" "$SETFILE"; then
+  echo "INFO: Copying SET file..."
   cp -f $VFLAG "$SETFILE" "$TESTER_DIR/$EA_SETFILE"
 fi