diff --git a/components/lazutils/fileutil.pas b/components/lazutils/fileutil.pas
index f6e9006efd..2882badbbc 100644
--- a/components/lazutils/fileutil.pas
+++ b/components/lazutils/fileutil.pas
@@ -214,9 +214,9 @@ function SetCurrentDirUTF8(const NewDir: String): Boolean;
 function CreateDirUTF8(const NewDir: String): Boolean;
 function RemoveDirUTF8(const Dir: String): Boolean;
 function ForceDirectoriesUTF8(const Dir: string): Boolean;
-function FileOpenUTF8(Const FileName : utf8string; Mode : Integer) : THandle;
-function FileCreateUTF8(Const FileName : utf8String) : THandle; overload;
-function FileCreateUTF8(Const FileName : utf8String; Rights: Cardinal) : THandle; overload;
+function FileOpenUTF8(Const FileName : string; Mode : Integer) : THandle;
+function FileCreateUTF8(Const FileName : string) : THandle; overload;
+function FileCreateUTF8(Const FileName : string; Rights: Cardinal) : THandle; overload;
 
 // environment
 function ParamStrUTF8(Param: Integer): string;
diff --git a/components/lazutils/lazutf16.pas b/components/lazutils/lazutf16.pas
index 3535332dc5..bdc4e2f6b3 100644
--- a/components/lazutils/lazutf16.pas
+++ b/components/lazutils/lazutf16.pas
@@ -41,7 +41,7 @@ function UTF16CharacterToUnicode(p: PWideChar; out CharLen: integer): Cardinal;
 function UnicodeToUTF16(u: cardinal): widestring;
 
 function UnicodeLowercase(u: cardinal): cardinal;
-function UTF8LowerCaseViaTables(const s: utf8string): utf8string;
+function UTF8LowerCaseViaTables(const s: string): string;
 
 implementation
 
@@ -896,7 +896,7 @@ begin
   end;
 end;
 
-function UTF8LowerCaseViaTables(const s: utf8string): utf8string;
+function UTF8LowerCaseViaTables(const s: string): string;
 var
   i: PtrInt;
   CharLen: integer;
diff --git a/components/lazutils/lazutf8.pas b/components/lazutils/lazutf8.pas
index a16e0b7e97..f8598f307a 100644
--- a/components/lazutils/lazutf8.pas
+++ b/components/lazutils/lazutf8.pas
@@ -61,8 +61,8 @@ function UTF8Copy(const s: string; StartCharIndex, CharCount: PtrInt): string;
 procedure UTF8Delete(var s: String; StartCharIndex, CharCount: PtrInt);
 procedure UTF8Insert(const source: String; var s: string; StartCharIndex: PtrInt);
 
-function UTF8LowerCase(const AInStr: utf8string; ALanguage: utf8string=''): utf8string;
-function UTF8UpperCase(const AInStr: utf8string; ALanguage: utf8string=''): utf8string;
+function UTF8LowerCase(const AInStr: string; ALanguage: string=''): string;
+function UTF8UpperCase(const AInStr: string; ALanguage: string=''): string;
 function FindInvalidUTF8Character(p: PChar; Count: PtrInt;
                                   StopOnNonASCII: Boolean = false): PtrInt;
 function ValidUTF8String(const s: String): String;
@@ -71,8 +71,8 @@ procedure AssignUTF8ListToAnsi(UTF8List, AnsiList: TStrings);
 
 //compare functions
 
-function UTF8CompareStr(const S1, S2: utf8string): Integer;
-function UTF8CompareText(const S1, S2: utf8string): Integer;
+function UTF8CompareStr(const S1, S2: string): Integer;
+function UTF8CompareText(const S1, S2: string): Integer;
 
 type
   TConvertResult = (trNoError, trNullSrc, trNullDest, trDestExhausted,
@@ -668,7 +668,7 @@ end;
   The columns in the file UnicodeData.txt are explained here:
   http://www.ksu.ru/eng/departments/ktk/test/perl/lib/unicode/UCDFF301.html#Case Mappings
 }
-function UTF8LowerCase(const AInStr: utf8string; ALanguage: utf8string=''): utf8string;
+function UTF8LowerCase(const AInStr: string; ALanguage: string=''): string;
 var
   CounterDiff: PtrInt;
   InStr, InStrEnd, OutStr: PChar;
@@ -1810,7 +1810,7 @@ end;
   The columns in the file UnicodeData.txt are explained here:
   http://www.ksu.ru/eng/departments/ktk/test/perl/lib/unicode/UCDFF301.html#Case Mappings
 }
-function UTF8UpperCase(const AInStr: utf8string; ALanguage: utf8string=''): utf8string;
+function UTF8UpperCase(const AInStr: string; ALanguage: string=''): string;
 var
   i, InCounter, OutCounter: PtrInt;
   OutStr: PChar;
@@ -2270,7 +2270,7 @@ end;
   Note: Use this function instead of AnsiCompareStr.
   This function guarantees proper collation on all supported platforms.
  ------------------------------------------------------------------------------}
-function UTF8CompareStr(const S1, S2: utf8string): Integer;
+function UTF8CompareStr(const S1, S2: string): Integer;
 begin
   Result := SysUtils.CompareStr(S1, S2);
 end;
@@ -2283,9 +2283,9 @@ end;
   Note: Use this function instead of AnsiCompareText.
   This function guarantees proper collation on all supported platforms.
  ------------------------------------------------------------------------------}
-function UTF8CompareText(const S1, S2: utf8string): Integer;
+function UTF8CompareText(const S1, S2: string): Integer;
 var
-  S1Lower, S2Lower: utf8string;
+  S1Lower, S2Lower: string;
 begin
   S1Lower := UTF8LowerCase(S1);
   S2Lower := UTF8LowerCase(S2);
diff --git a/components/lazutils/unixfileutil.inc b/components/lazutils/unixfileutil.inc
index 24a231a880..0332f33bea 100644
--- a/components/lazutils/unixfileutil.inc
+++ b/components/lazutils/unixfileutil.inc
@@ -377,17 +377,17 @@ begin
   Result:=SysUtils.DirectoryExists(UTF8ToSys(Directory));
 end;
 
-function FileOpenUTF8(Const FileName : utf8string; Mode : Integer) : THandle;
+function FileOpenUTF8(Const FileName : string; Mode : Integer) : THandle;
 begin
   Result := SysUtils.FileOpen(FileName, Mode);
 end;
 
-function FileCreateUTF8(Const FileName : utf8string) : THandle;
+function FileCreateUTF8(Const FileName : string) : THandle;
 begin
   Result := SysUtils.FileCreate(FileName);
 end;
 
-function FileCreateUTF8(Const FileName : utf8String; Rights: Cardinal) : THandle;
+function FileCreateUTF8(Const FileName : string; Rights: Cardinal) : THandle;
 begin
   Result := SysUtils.FileCreate(FileName, Rights);
 end;
diff --git a/components/lazutils/winfileutil.inc b/components/lazutils/winfileutil.inc
index e574b0c490..0764f832aa 100644
--- a/components/lazutils/winfileutil.inc
+++ b/components/lazutils/winfileutil.inc
@@ -588,7 +588,7 @@ begin
     Result:=False;
 end;
 
-function FileOpenUTF8(Const FileName : utf8string; Mode : Integer) : THandle;
+function FileOpenUTF8(Const FileName : string; Mode : Integer) : THandle;
 const
   AccessMode: array[0..2] of Cardinal  = (
     GENERIC_READ,
@@ -607,13 +607,13 @@ begin
   //if fail api return feInvalidHandle (INVALIDE_HANDLE=feInvalidHandle=-1)
 end;
 
-function FileCreateUTF8(Const FileName : utf8string) : THandle;
+function FileCreateUTF8(Const FileName : string) : THandle;
 begin
   Result := CreateFileW(PWideChar(UTF8Decode(FileName)), GENERIC_READ or GENERIC_WRITE,
                        0, nil, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0);
 end;
 
-function FileCreateUTF8(Const FileName : utf8String; Rights: Cardinal) : THandle;
+function FileCreateUTF8(Const FileName : string; Rights: Cardinal) : THandle;
 begin
   Result := CreateFileW(PWideChar(UTF8Decode(FileName)), GENERIC_READ or GENERIC_WRITE,
                        0, nil, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0);