diff --git a/snapcontrol.exe b/snapcontrol.exe
index 145605b..501ea32 100644
Binary files a/snapcontrol.exe and b/snapcontrol.exe differ
diff --git a/snapcontrol.pb b/snapcontrol.pb
index 44379b7..4812e75 100644
--- a/snapcontrol.pb
+++ b/snapcontrol.pb
@@ -7,7 +7,7 @@
 ; LICENSE  : MIT License
 ; AUTHOR   : Michael H.G. Schmidt
 ; EMAIL    : michael@schmidt2.de
-; DATE     : 20230319
+; DATE     : 20230723
 ; ------------------------------------------------------------
 ;
 ; This tool creates an image backups of windows machines,
@@ -28,7 +28,7 @@ EnableGraphicalConsole(0)
 
 Dim filelist$(0)
 
-Global VERSION$="V1.11"
+Global VERSION$="V1.12"
 Global updatesched = 0
 Global dryrun = 0
 Global silentmode = 0
@@ -38,6 +38,8 @@ Global month$ = FormatDate("%mm", Date())
 Global day$ = FormatDate("%dd", Date())
 Global DriveSnapshotVersionOk = 0
 Global DoShutdown = 0
+Global RC = 0     ; returncode
+Global RC_ALL = 0 ; cumulated returncode
 
 ; Timeout for shutodwn is 2 minutes ...
 Global Shutdowncommand$ = "shutdown /s /t 120 /d p:0:0"
@@ -60,6 +62,16 @@ Procedure Usage()
   PrintN ("    /V = show version")
   PrintN ("    /D = dry run")
   PrintN ("    /? = help")
+  PrintN ("")
+  PrintN ("RETURNCODES:")
+  PrintN ("-----------------------------------------------------")
+  PrintN ("99 = usage was called / wrong arguments or parameters")
+  PrintN ("98 = cannot read inifile (does not exist ?)")
+  PrintN ("97 = i don't have admin rights")
+  PrintN ("96 = mailer (cmail) not found or not working")
+  PrintN ("95 = Drive Snapshot version is not supported")
+  PrintN ("94 = Drive Snapshot exe not found")
+  PrintN (" 0 = OK")
   End 99
 EndProcedure
 
@@ -146,7 +158,7 @@ EndIf
 ; Drive Snapshot found ?
 If ( FileSize ( SnapshotBin$ ) < 0 )
   PrintN("ERROR: [ " + SnapshotBin$ + " ] NOT found.")
-  End 1
+  End 94
 EndIf
 
 Global MailCommand$ = BinPath$ + "\cmail.exe"
@@ -154,7 +166,7 @@ Global MailCommand$ = BinPath$ + "\cmail.exe"
 ; CMail found ?
 If ( FileSize ( MailCommand$ ) < 0 And MailReport$ = "yes")
   PrintN("ERROR: [ " + MailCommand$ + " ] NOT found.")
-  End 1
+  End 96
 EndIf
 
 ; Version check for Drive Snapshot ...
@@ -179,7 +191,7 @@ If ( DriveSnapshotVersionOk = 0 )
   ForEach DriveSnapshotVersion$()
     PrintN("  - " + DriveSnapshotVersion$())
   Next
-  End 1
+  End 95
 EndIf
 
 ;
@@ -250,7 +262,6 @@ Procedure EndProg(err)
   Else
     LogMe("ERROR: END of BACKUP with result FAILED !")
     s$ = "BACKUP report - { ERROR ! } @" + hostname$
-  
   EndIf
   
   ; send a report via mail ?
@@ -402,8 +413,8 @@ If ( dryrun = 1 )
   LogMe("DRYRUN - (simulating a backup run) !!!")
 EndIf
 
-e = IsAdmin()
-If ( e = 0 )
+RC = IsAdmin()
+If ( RC = 0 )
   LogMe("OK. Running as Admin ...")  
 Else
   PrintN("ERROR: Please run as Administrator !")
@@ -468,7 +479,7 @@ If ( FtpBackup$ = "yes" )
   LogMe("INFO: FTP backup, using server [ " + FtpServer$ + " ] for backup ...")
   
   ; add ftp account ...
-  e = system(SnapshotBin$ + " --AddFTPAccount:" + TargetUser$ + "," + FtpServer$ + "," + TargetPassword$)
+  RC = system(SnapshotBin$ + " --AddFTPAccount:" + TargetUser$ + "," + FtpServer$ + "," + TargetPassword$)
   
   ; generate filenames for backup ...
   DumpFile$ =       TargetPath$ + "/" + hostname$ + "_snapshot_" + month$ + "_$type_$disk.sna"
@@ -513,11 +524,11 @@ Else
     FinishDirectory(0)
   EndIf
   
-  e = 0
+  ; do a quickcheck ...
   For i = 1 To ArraySize(filelist$())
     LogMe("INFO: Starting QUICKCHECK for [ " + filelist$(i-1) + " ]")
-    e = system(SnapshotBin$ + " --Logfile:" + LogFile$ + " --QuickCheck:" + TargetPath$ + "\" + filelist$(i-1))
-    If ( e <> 0 )
+    RC = system(SnapshotBin$ + " --Logfile:" + LogFile$ + " --QuickCheck:" + TargetPath$ + "\" + filelist$(i-1))
+    If ( RC <> 0 )
       LogMe("ERROR: DELETING last full backup [ REASON: corrupt file! ]")
       dummy = system("del /F /Q " + TargetPath$ + "\" + hostname$ + "_snapshot_" + month$ + "_ful*.*")
       Break
@@ -550,23 +561,36 @@ EndIf
 LogMe("  HashFile:    [ " + Mid(HashFile$,3) + " ]")
 LogMe("  LogFile:     [ " + LogFile$ + " ]")
 
+; execute snapshot64 ...
 If ( dryrun = 0 )
-  e = system(SnapshotBin$ + " --Logfile:" + LogFile$ + " " + params$ + " " + DumpFile$ + " " + HashFile$)
-  
+  RC = system(SnapshotBin$ + " --Logfile:" + LogFile$ + " " + params$ + " " + DumpFile$ + " " + HashFile$)
+  RC_ALL = RC_ALL + RC
+
+  If ( RC > 0 )
+    LogMe("ERROR: while executing [ " + SnapshotBin$ + " ]!")
+  EndIf
+
   If DoShutdown = 1
     LogMe("INFO: shutdown was requested ...")
     LogMe("INFO: executing [ " + ShutdownCommand$ + " ]")
-    e = system(ShutdownCommand$)
+    RC = system(ShutdownCommand$)
+    RC_ALL = RC_ALL + RC
+
+    If ( RC > 0 )
+      LogMe("ERROR: while executing shutdown command!")
+    EndIf
+
   EndIf
   
 EndIf
 
 ; end with return code...
-EndProg(e)
+EndProg(RC_ALL)
 
 ; IDE Options = PureBasic 5.73 LTS (Windows - x64)
 ; ExecutableFormat = Console
-; CursorPosition = 20
+; CursorPosition = 44
+; FirstLine = 41
 ; Folding = --
 ; EnableXP
 ; Executable = snapcontrol.exe