diff --git a/AGBPipe.lua b/AGBPipe.lua
index eeba67c..60383f2 100644
--- a/AGBPipe.lua
+++ b/AGBPipe.lua
@@ -188,8 +188,9 @@ local function Calc_WindowHardware( nManufacturer, QuestionArgs)
       -- Apro file Input in scrittura
       local fhInput = io.open( sInputFile, 'w')
       if not fhInput then
-         EgtOutLog( 'Error opening file ' .. sInputFile)
-         return false
+         local sErrorMsg = 'Error opening file ' .. sInputFile
+         EgtOutLog(sErrorMsg)
+         return 0, { Error = sErrorMsg}
       end
       
       local ReturnMode = tonumber( QuestionArgs['ReturnMode'])
@@ -238,8 +239,18 @@ local function Calc_WindowHardware( nManufacturer, QuestionArgs)
          -- Apro file OptionList in lettura
          local fhOptionList = io.open( sInputOptionFile, 'r')
          if not fhOptionList then
-            EgtOutLog( 'Error opening file ' .. sInputOptionFile)
-            return false
+            local sErrorInputOptionFile = EgtChangePathExtension( sInputOptionFile, '.err')
+            local fhHardwareOptionListError = io.open( sErrorInputOptionFile, 'r')
+            if not fhHardwareOptionListError then
+               local sErrorMsg = 'Error opening file ' .. sInputOptionFile
+               EgtOutLog(sErrorMsg)
+               return 0, { Error = sErrorMsg}
+            else
+               local sErrorMsg = 'Error opening file ' .. sInputOptionFile .. '\n'  .. fhHardwareOptionListError:read('*a')
+               fhHardwareOptionListError:close()
+               EgtOutLog(sErrorMsg)
+               return 0, { Error = sErrorMsg}
+            end
          end
          OptionList = fhOptionList:read('*a')
          -- Chiudo file OutputKit in lettura
@@ -262,8 +273,18 @@ local function Calc_WindowHardware( nManufacturer, QuestionArgs)
          -- Apro file OptionList in lettura
          local fhHardwareList = io.open( sOutputKitFile, 'r')
          if not fhHardwareList then
-            EgtOutLog( 'Error opening file ' .. sOutputKitFile)
-            return false
+            local sErrorOutputKitFile = EgtChangePathExtension( sOutputKitFile, '.err')
+            local fhHardwareListError = io.open( sErrorOutputKitFile, 'r')
+            if not fhHardwareListError then
+               local sErrorMsg = 'Error opening file ' .. sOutputKitFile
+               EgtOutLog(sErrorMsg)
+               return 0, { Error = sErrorMsg}
+            else
+               local sErrorMsg = 'Error opening file ' .. sOutputKitFile .. '\n'  .. fhHardwareListError:read('*a')
+               fhHardwareListError:close()
+               EgtOutLog(sErrorMsg)
+               return 0, { Error = sErrorMsg}
+            end
          end
          local nHardwareLineIndex = 1
          for sLine in fhHardwareList:lines('l') do
@@ -294,8 +315,18 @@ local function Calc_WindowHardware( nManufacturer, QuestionArgs)
          -- Apro file OptionList in lettura
          local fhMachiningList = io.open( sOutputMachiningFile, 'r')
          if not fhMachiningList then
-            EgtOutLog( 'Error opening file ' .. sOutputMachiningFile)
-            return false
+            local sErrorOutputMachiningFile = EgtChangePathExtension( sOutputMachiningFile, '.err')
+            local fhMachiningListError = io.open( sErrorOutputMachiningFile, 'r')
+            if not fhMachiningListError then
+               local sErrorMsg = 'Error opening file ' .. sOutputMachiningFile
+               EgtOutLog(sErrorMsg)
+               return 0, { Error = sErrorMsg}
+            else
+               local sErrorMsg = 'Error opening file ' .. sOutputMachiningFile .. '\n'  .. fhMachiningListError:read('*a')
+               fhMachiningListError:close()
+               EgtOutLog(sErrorMsg)
+               return 0, { Error = sErrorMsg}
+            end
          end
          local nMachiningLineIndex = 1
          for sLine in fhMachiningList:lines('l') do
@@ -329,8 +360,18 @@ local function Calc_WindowHardware( nManufacturer, QuestionArgs)
          -- Apro file OptionList in lettura
          local fhPositionList = io.open( sOutputPositionFile, 'r')
          if not fhPositionList then
-            EgtOutLog( 'Error opening file ' .. sOutputPositionFile)
-            return false
+            local sErrorOutputPositionFile = EgtChangePathExtension( sOutputPositionFile, '.err')
+            local fhHardwarePositionListError = io.open( sErrorOutputPositionFile, 'r')
+            if not fhHardwarePositionListError then
+               local sErrorMsg = 'Error opening file ' .. sOutputPositionFile
+               EgtOutLog(sErrorMsg)
+               return 0, { Error = sErrorMsg}
+            else
+               local sErrorMsg = 'Error opening file ' .. sOutputPositionFile .. '\n'  .. fhHardwarePositionListError:read('*a')
+               fhHardwarePositionListError:close()
+               EgtOutLog(sErrorMsg)
+               return 0, { Error = sErrorMsg}
+            end
          end
          local nPositionLineIndex = 1
          for sLine in fhPositionList:lines('l') do