diff --git a/Source/build.cpp b/Source/build.cpp
index 2b5c6d43..1a0cd917 100644
--- a/Source/build.cpp
+++ b/Source/build.cpp
@@ -985,18 +985,11 @@ int CEXEBuild::resolve_instruction(const char *fn, const char *str, entry *w, in
     if (resolve_jump_int(fn,&w->offsets[1],offs,start,end)) return 1;
     if (resolve_jump_int(fn,&w->offsets[2],offs,start,end)) return 1;
   }
-  else if (w->which == EW_IFERRORS)
+  else if (w->which == EW_IFFLAG)
   {
     if (resolve_jump_int(fn,&w->offsets[0],offs,start,end)) return 1;
     if (resolve_jump_int(fn,&w->offsets[1],offs,start,end)) return 1;
   }
-#ifdef NSIS_SUPPORT_REBOOT
-  else if (w->which == EW_IFREBOOTFLAG)
-  {
-    if (resolve_jump_int(fn,&w->offsets[0],offs,start,end)) return 1;
-    if (resolve_jump_int(fn,&w->offsets[1],offs,start,end)) return 1;
-  }
-#endif
 #ifdef NSIS_SUPPORT_STROPTS
   else if (w->which == EW_STRCMP)
   {
@@ -2309,7 +2302,7 @@ again:
   ret=add_entry_direct(EW_CREATEDIR, zero_offset);
   if (ret != PS_OK) return ret;
   // IfErrors Initialize_____Plugins_error - detect errors
-  ret=add_entry_direct(EW_IFERRORS, ns_label.add("Initialize_____Plugins_error",0));
+  ret=add_entry_direct(EW_IFFLAG, ns_label.add("Initialize_____Plugins_error",0), 0, FIELD_OFFSET(installer_flags, exec_error));
   if (ret != PS_OK) return ret;
   // Copy $0 to $PLUGINSDIR
   ret=add_entry_direct(EW_PLUGINCOMMANDPREP);
diff --git a/Source/exehead/Ui.c b/Source/exehead/Ui.c
index cc2adc04..43c72c5a 100644
--- a/Source/exehead/Ui.c
+++ b/Source/exehead/Ui.c
@@ -79,7 +79,7 @@ int num_sections;
 
 #define WM_TREEVIEW_KEYHACK (WM_USER+0x13)
 
-static int m_page=-1,m_abort,m_retcode,m_delta=1;
+static int m_page=-1,m_retcode,m_delta=1;
 
 #define NOTIFY_BYE_BYE 'x'
 
@@ -631,7 +631,7 @@ nextPage:
     }
     if (id == IDCANCEL)
     {
-      if (m_abort)
+      if (g_flags.abort)
       {
 #ifdef NSIS_SUPPORT_CODECALLBACKS
         ExecuteCodeSegment(g_inst_cmnheader->code_onInstFailed,NULL);
@@ -1332,20 +1332,20 @@ static DWORD WINAPI install_thread(LPVOID p)
 #ifdef NSIS_CONFIG_UNINSTALL_SUPPORT
   if (g_is_uninstaller)
   {
-    if (ExecuteCodeSegment(g_inst_uninstheader->code,g_progresswnd)) m_abort++;
+    if (ExecuteCodeSegment(g_inst_uninstheader->code,g_progresswnd)) g_flags.abort++;
   }
   else
   {
 #endif
     int m_inst_sec=0;
-    while (m_inst_sec<num_sections && !m_abort)
+    while (m_inst_sec<num_sections && !g_flags.abort)
     {
 #ifdef NSIS_CONFIG_COMPONENTPAGE
       if (g_inst_section[m_inst_sec].flags&SF_SELECTED)
 #endif
       {
         log_printf2("Section: \"%s\"",GetStringFromStringTab(g_inst_section[m_inst_sec].name_ptr));
-        if (ExecuteCodeSegment(g_inst_section[m_inst_sec].code,g_progresswnd)) m_abort++;
+        if (ExecuteCodeSegment(g_inst_section[m_inst_sec].code,g_progresswnd)) g_flags.abort++;
       }
 #ifdef NSIS_CONFIG_COMPONENTPAGE
       else
@@ -1358,8 +1358,8 @@ static DWORD WINAPI install_thread(LPVOID p)
 #ifdef NSIS_CONFIG_UNINSTALL_SUPPORT
   }
 #endif
-  if (m_curwnd) SendMessage(m_curwnd,WM_NOTIFY_INSTPROC_DONE,m_abort,0);
-  return m_abort;
+  if (m_curwnd) SendMessage(m_curwnd,WM_NOTIFY_INSTPROC_DONE,g_flags.abort,0);
+  return g_flags.abort;
 }
 
 #ifdef NSIS_CONFIG_VISIBLE_SUPPORT
diff --git a/Source/exehead/exec.c b/Source/exehead/exec.c
index 7efd1b29..e3ff7979 100644
--- a/Source/exehead/exec.c
+++ b/Source/exehead/exec.c
@@ -24,7 +24,7 @@ typedef struct _stack_t {
 static stack_t *g_st;
 #endif
 
-union flags g_flags;
+union installer_flags g_flags;
 
 #ifdef NSIS_CONFIG_PLUGIN_SUPPORT
 char plugins_temp_dir[NSIS_MAX_STRLEN]="";
@@ -208,6 +208,12 @@ static int NSISCALL ExecuteEntry(entry *entry_)
     case EW_SETFLAG:
       g_flags.flags[parm0]=parm1;
     break;
+    case EW_IFFLAG:
+    {
+      int f=entry_->offsets[!g_flags.flags[parm2]];
+      g_flags.flags[parm2]&=parm3;
+      return f;
+    }
     case EW_CHDETAILSVIEW:
       if (insthwndbutton) ShowWindow(insthwndbutton,parm1);
       if (insthwnd) ShowWindow(insthwnd,parm0);
@@ -274,12 +280,6 @@ static int NSISCALL ExecuteEntry(entry *entry_)
       log_printf3("IfFileExists: file \"%s\" does not exist, jumping %d",buf0,parm2);
     }
     return parm2;
-    case EW_IFERRORS:
-    {
-      int f=entry_->offsets[!g_flags.exec_error];
-      g_flags.exec_error=0;
-      return f;
-    }
 #ifdef NSIS_SUPPORT_RENAME
     case EW_RENAME:
       {
@@ -1110,7 +1110,6 @@ static int NSISCALL ExecuteEntry(entry *entry_)
         FreeLibrary(h);
       }
     break;
-    case EW_IFREBOOTFLAG: return entry_->offsets[!g_flags.exec_reboot];
 #endif//NSIS_SUPPORT_REBOOT
 #ifdef NSIS_SUPPORT_INIFILES
     case EW_WRITEINI:
diff --git a/Source/exehead/exec.h b/Source/exehead/exec.h
index 8571e0b6..f18ebc97 100644
--- a/Source/exehead/exec.h
+++ b/Source/exehead/exec.h
@@ -1,17 +1,7 @@
 #ifndef _EXEC_H_
 #define _EXEC_H_
 
-extern union flags {
-  struct {
-    int autoclose;
-    int all_user_var;
-    int exec_error;
-#ifdef NSIS_SUPPORT_REBOOT
-    int exec_reboot;
-#endif
-  };
-  int flags[1];
-} g_flags;
+extern union installer_flags g_flags;
 
 int NSISCALL ExecuteCodeSegment(int pos, HWND hwndProgress); // returns 0 on success
 
diff --git a/Source/exehead/fileform.h b/Source/exehead/fileform.h
index b4997c67..d6b9ea40 100644
--- a/Source/exehead/fileform.h
+++ b/Source/exehead/fileform.h
@@ -45,8 +45,8 @@ enum
   EW_SETFILEATTRIBUTES, // SetFileAttributes: 2 [filename, attributes]
   EW_CREATEDIR,         // Create directory: 2, [path, ?update$INSTDIR]
   EW_IFFILEEXISTS,      // IfFileExists: 3, [file name, jump amount if exists, jump amount if not exists]
-  EW_IFERRORS,          // IfErrors: 2 [jump if error, jump if not error]
   EW_SETFLAG,           // Sets a flag: 2 [id, data]
+  EW_IFFLAG,            // If a flag: 4 [on, off, id, new value mask]
 #ifdef NSIS_SUPPORT_RENAME
   EW_RENAME,            // Rename: 3 [old, new, rebootok]
 #endif
@@ -513,5 +513,17 @@ DWORD NSISCALL SetSelfFilePointer(LONG lDistanceToMove, DWORD dwMoveMethod);
   #define VAR_CODES_START (256 - 36)
 #endif
 
+union installer_flags {
+  struct {
+    int autoclose;
+    int all_user_var;
+    int exec_error;
+    int abort;
+#ifdef NSIS_SUPPORT_REBOOT
+    int exec_reboot;
+#endif
+  };
+  int flags[1];
+};
 
 #endif //_FILEFORM_H_
diff --git a/Source/script.cpp b/Source/script.cpp
index b6afe129..b87ba616 100644
--- a/Source/script.cpp
+++ b/Source/script.cpp
@@ -356,6 +356,8 @@ int CEXEBuild::process_jump(LineParser &line, int wt, int *offs)
   return 0;
 }
 
+#define FLAG_OFFSET(flag) (FIELD_OFFSET(installer_flags, flag)/sizeof(int))
+
 int CEXEBuild::doCommand(int which_token, LineParser &line, FILE *fp, const char *curfilename, int *lineptr)
 {
   int linecnt = *lineptr;
@@ -2470,7 +2472,7 @@ int CEXEBuild::doCommand(int which_token, LineParser &line, FILE *fp, const char
     return add_entry(&ent);
     case TOK_SETSHELLVARCONTEXT:
       ent.which=EW_SETFLAG;
-      ent.offsets[0]=1;
+      ent.offsets[0]=FLAG_OFFSET(all_user_var);
       ent.offsets[1]=line.gettoken_enum(1,"current\0all\0");
       if (ent.offsets[1]<0) PRINTHELP()
       SCRIPT_MSG("SetShellVarContext: %s\n",line.gettoken_str(1));
@@ -3248,26 +3250,35 @@ int CEXEBuild::doCommand(int which_token, LineParser &line, FILE *fp, const char
     return add_entry(&ent);
     case TOK_SETAUTOCLOSE:
       ent.which=EW_SETFLAG;
-      ent.offsets[0]=0;
+      ent.offsets[0]=FLAG_OFFSET(autoclose);
       ent.offsets[1]=line.gettoken_enum(1,"false\0true\0");
       if (ent.offsets[1] < 0) PRINTHELP()
       SCRIPT_MSG("SetAutoClose: %s\n",line.gettoken_str(1));
     return add_entry(&ent);
     case TOK_IFERRORS:
-      ent.which=EW_IFERRORS;
+      ent.which=EW_IFFLAG;
       if (process_jump(line,1,&ent.offsets[0]) ||
           process_jump(line,2,&ent.offsets[1])) PRINTHELP()
+      ent.offsets[2]=FLAG_OFFSET(exec_error);
+      ent.offsets[3]=0;//new value mask - clean error
       SCRIPT_MSG("IfErrors ?%s:%s\n",line.gettoken_str(1),line.gettoken_str(2));
+    case TOK_IFABORT:
+      ent.which=EW_IFFLAG;
+      if (process_jump(line,1,&ent.offsets[0]) ||
+          process_jump(line,2,&ent.offsets[1])) PRINTHELP()
+      ent.offsets[2]=FLAG_OFFSET(abort);
+      ent.offsets[3]=(int)~0;//new value mask - keep flag
+      SCRIPT_MSG("IfAbort ?%s:%s\n",line.gettoken_str(1),line.gettoken_str(2));
     return add_entry(&ent);
     case TOK_CLEARERRORS:
       ent.which=EW_SETFLAG;
-      ent.offsets[0]=2;
+      ent.offsets[0]=FLAG_OFFSET(exec_error);
       ent.offsets[1]=0;
       SCRIPT_MSG("ClearErrors\n");
     return add_entry(&ent);
     case TOK_SETERRORS:
       ent.which=EW_SETFLAG;
-      ent.offsets[0]=2;
+      ent.offsets[0]=FLAG_OFFSET(exec_error);
       ent.offsets[1]=1;
       SCRIPT_MSG("SetErrors\n");
     return add_entry(&ent);
@@ -3997,14 +4008,16 @@ int CEXEBuild::doCommand(int which_token, LineParser &line, FILE *fp, const char
       SCRIPT_MSG("Reboot! (WOW)\n");
     return add_entry(&ent);
     case TOK_IFREBOOTFLAG:
-      ent.which=EW_IFREBOOTFLAG;
+      ent.which=EW_IFFLAG;
       if (process_jump(line,1,&ent.offsets[0]) ||
           process_jump(line,2,&ent.offsets[1])) PRINTHELP()
+      ent.offsets[2]=FLAG_OFFSET(exec_reboot);
+      ent.offsets[3]=(int)~0;//new value mask - keep flag
       SCRIPT_MSG("IfRebootFlag ?%s:%s\n",line.gettoken_str(1),line.gettoken_str(2));
     return add_entry(&ent);
     case TOK_SETREBOOTFLAG:
       ent.which=EW_SETFLAG;
-      ent.offsets[0]=3;
+      ent.offsets[0]=FLAG_OFFSET(exec_reboot);
       ent.offsets[1]=line.gettoken_enum(1,"false\0true\0");
       if (ent.offsets[1] < 0) PRINTHELP()
     return add_entry(&ent);
diff --git a/Source/tokens.cpp b/Source/tokens.cpp
index 53849bf1..527f2671 100644
--- a/Source/tokens.cpp
+++ b/Source/tokens.cpp
@@ -80,6 +80,7 @@ static tokenType tokenlist[TOK__LAST] =
 {TOK_GETWINTEXT,"GetWindowText",2,0,"$(user_var: handle output) hwnd"},
 {TOK_HIDEWINDOW,"HideWindow",0,0,""},
 {TOK_ICON,"Icon",1,0,"local_icon.ico"},
+{TOK_IFABORT,"IfAbort",1,1,"label_to_goto_if_abort [label_to_goto_if_no_abort]"},
 {TOK_IFERRORS,"IfErrors",1,1,"label_to_goto_if_errors [label_to_goto_if_no_errors]"},
 {TOK_IFFILEEXISTS,"IfFileExists",2,1,"filename label_to_goto_if_file_exists [label_to_goto_otherwise]"},
 {TOK_IFREBOOTFLAG,"IfRebootFlag",1,1,"jump_if_set [jump_if_not_set]"},
diff --git a/Source/tokens.h b/Source/tokens.h
index 07b7daca..7a9873e4 100644
--- a/Source/tokens.h
+++ b/Source/tokens.h
@@ -144,6 +144,7 @@ enum
   TOK_IFERRORS,
   TOK_CLEARERRORS,
   TOK_SETERRORS,
+  TOK_IFABORT,
   TOK_STRCPY,
   TOK_STRCMP,
   TOK_GETTEMPFILENAME,