diff --git a/applications/fpvviewer/uncompressor/mainform.lfm b/applications/fpvviewer/uncompressor/mainform.lfm
new file mode 100644
index 000000000..35dab178f
--- /dev/null
+++ b/applications/fpvviewer/uncompressor/mainform.lfm
@@ -0,0 +1,40 @@
+object Form1: TForm1
+  Left = 241
+  Height = 121
+  Top = 161
+  Width = 320
+  Caption = 'GZ Uncompressor'
+  ClientHeight = 121
+  ClientWidth = 320
+  LCLVersion = '1.1'
+  object editFileName: TFileNameEdit
+    Left = 8
+    Height = 23
+    Top = 32
+    Width = 264
+    FileName = 'D:\lazarusccr\applications\fpvviewer\examples_files\svgz\tassu_20130329_b.svgz'
+    FilterIndex = 0
+    HideDirectories = False
+    ButtonWidth = 23
+    NumGlyphs = 1
+    MaxLength = 0
+    TabOrder = 0
+  end
+  object Button1: TButton
+    Left = 16
+    Height = 25
+    Top = 80
+    Width = 288
+    Caption = 'Uncompress gz'
+    OnClick = Button1Click
+    TabOrder = 1
+  end
+  object Label1: TLabel
+    Left = 8
+    Height = 15
+    Top = 15
+    Width = 132
+    Caption = 'File to be uncompressed:'
+    ParentColor = False
+  end
+end
diff --git a/applications/fpvviewer/uncompressor/mainform.pas b/applications/fpvviewer/uncompressor/mainform.pas
new file mode 100644
index 000000000..b9b24271c
--- /dev/null
+++ b/applications/fpvviewer/uncompressor/mainform.pas
@@ -0,0 +1,75 @@
+unit mainform;
+
+{$mode objfpc}{$H+}
+
+interface
+
+uses
+  Classes, SysUtils, FileUtil, Forms, Controls, Graphics, Dialogs, EditBtn,
+  StdCtrls;
+
+type
+
+  { TForm1 }
+
+  TForm1 = class(TForm)
+    Button1: TButton;
+    editFileName: TFileNameEdit;
+    Label1: TLabel;
+    procedure Button1Click(Sender: TObject);
+  private
+    { private declarations }
+  public
+    { public declarations }
+    procedure InflateGZ(AGZFilename: string; ADest: TStream);
+  end;
+
+var
+  Form1: TForm1;
+
+implementation
+
+uses zstream;
+
+{$R *.lfm}
+
+{ TForm1 }
+
+procedure TForm1.Button1Click(Sender: TObject);
+var
+  DestStream: TFileStream;
+  lDestFilename: string;
+begin
+  lDestFilename := Copy(editFileName.Text, 1, Length(editFileName.Text)-1);
+  DestStream := TFileStream.Create(lDestFilename, fmCreate);
+  try
+    InflateGZ(editFileName.Text, DestStream);
+  finally
+    DestStream.Free;
+  end;
+end;
+
+procedure TForm1.InflateGZ(AGZFilename: string; ADest: TStream);
+var
+  GZStream: TGZFileStream;
+  chunk:string;
+  cnt:integer;
+const
+  CHUNKSIZE=4096;
+begin
+  GZStream := TGZFileStream.Create(AGZFilename, gzopenread);
+  try
+    setlength(chunk,CHUNKSIZE);
+    repeat
+      cnt := GZStream.read(chunk[1],CHUNKSIZE);
+      if cnt<CHUNKSIZE then
+        setlength(chunk,cnt);
+      ADest.Write(chunk[1], Length(chunk));
+    until cnt<CHUNKSIZE;
+  finally
+    GZStream.Free;
+  end;
+end;
+
+end.
+
diff --git a/applications/fpvviewer/uncompressor/uncompressor.lpi b/applications/fpvviewer/uncompressor/uncompressor.lpi
new file mode 100644
index 000000000..a433196ac
--- /dev/null
+++ b/applications/fpvviewer/uncompressor/uncompressor.lpi
@@ -0,0 +1,91 @@
+<?xml version="1.0"?>
+<CONFIG>
+  <ProjectOptions>
+    <Version Value="9"/>
+    <PathDelim Value="\"/>
+    <General>
+      <SessionStorage Value="InProjectDir"/>
+      <MainUnit Value="0"/>
+      <Title Value="uncompressor"/>
+      <ResourceType Value="res"/>
+      <UseXPManifest Value="True"/>
+      <Icon Value="0"/>
+    </General>
+    <i18n>
+      <EnableI18N LFM="False"/>
+    </i18n>
+    <VersionInfo>
+      <StringTable ProductVersion=""/>
+    </VersionInfo>
+    <BuildModes Count="1">
+      <Item1 Name="Default" Default="True"/>
+    </BuildModes>
+    <PublishOptions>
+      <Version Value="2"/>
+      <IncludeFileFilter Value="*.(pas|pp|inc|lfm|lpr|lrs|lpi|lpk|sh|xml)"/>
+      <ExcludeFileFilter Value="*.(bak|ppu|o|so);*~;backup"/>
+    </PublishOptions>
+    <RunParams>
+      <local>
+        <FormatVersion Value="1"/>
+      </local>
+    </RunParams>
+    <RequiredPackages Count="1">
+      <Item1>
+        <PackageName Value="LCL"/>
+      </Item1>
+    </RequiredPackages>
+    <Units Count="2">
+      <Unit0>
+        <Filename Value="uncompressor.lpr"/>
+        <IsPartOfProject Value="True"/>
+        <UnitName Value="uncompressor"/>
+      </Unit0>
+      <Unit1>
+        <Filename Value="mainform.pas"/>
+        <IsPartOfProject Value="True"/>
+        <ComponentName Value="Form1"/>
+        <HasResources Value="True"/>
+        <ResourceBaseClass Value="Form"/>
+        <UnitName Value="mainform"/>
+      </Unit1>
+    </Units>
+  </ProjectOptions>
+  <CompilerOptions>
+    <Version Value="11"/>
+    <PathDelim Value="\"/>
+    <Target>
+      <Filename Value="uncompressor"/>
+    </Target>
+    <SearchPaths>
+      <IncludeFiles Value="$(ProjOutDir)"/>
+      <UnitOutputDirectory Value="lib\$(TargetCPU)-$(TargetOS)"/>
+    </SearchPaths>
+    <Linking>
+      <Options>
+        <Win32>
+          <GraphicApplication Value="True"/>
+        </Win32>
+      </Options>
+    </Linking>
+    <Other>
+      <CompilerMessages>
+        <MsgFileName Value=""/>
+      </CompilerMessages>
+      <CompilerPath Value="$(CompPath)"/>
+    </Other>
+  </CompilerOptions>
+  <Debugging>
+    <Exceptions Count="3">
+      <Item1>
+        <Name Value="EAbort"/>
+      </Item1>
+      <Item2>
+        <Name Value="ECodetoolError"/>
+      </Item2>
+      <Item3>
+        <Name Value="EFOpenError"/>
+      </Item3>
+    </Exceptions>
+  </Debugging>
+</CONFIG>
diff --git a/applications/fpvviewer/uncompressor/uncompressor.lpr b/applications/fpvviewer/uncompressor/uncompressor.lpr
new file mode 100644
index 000000000..6202d57a2
--- /dev/null
+++ b/applications/fpvviewer/uncompressor/uncompressor.lpr
@@ -0,0 +1,21 @@
+program uncompressor;
+
+{$mode objfpc}{$H+}
+
+uses
+  {$IFDEF UNIX}{$IFDEF UseCThreads}
+  cthreads,
+  {$ENDIF}{$ENDIF}
+  Interfaces, // this includes the LCL widgetset
+  Forms, mainform
+  { you can add units after this };
+
+{$R *.res}
+
+begin
+  RequireDerivedFormResource := True;
+  Application.Initialize;
+  Application.CreateForm(TForm1, Form1);
+  Application.Run;
+end.
+
diff --git a/applications/fpvviewer/uncompressor/uncompressor.res b/applications/fpvviewer/uncompressor/uncompressor.res
new file mode 100644
index 000000000..7c6cf3e4b
Binary files /dev/null and b/applications/fpvviewer/uncompressor/uncompressor.res differ