Index: dw_ipflin.pas
===================================================================
--- dw_ipflin.pas	(revision 20081)
+++ dw_ipflin.pas	(working copy)
@@ -89,7 +89,6 @@
     procedure EndOverview; override;
     procedure WriteOverviewMember(const ALabel,AName,Access,ADescr : String); override;
     procedure WriteOverviewMember(const ALabel,AName,ADescr : String); override;
-    class function FileNameExtension: string; override;
     procedure DescrBeginURL(const AURL: DOMString); override;
     procedure DescrEndURL; override;
     // Description node conversion. Overrides for TFPDocWriter.
@@ -141,6 +140,7 @@
     // TFPDocWriter class methods
   public
     constructor Create(APackage: TPasPackage; AEngine: TFPDocEngine); override;
+    class function FileNameExtension: string; override;
   end;
 
 
Index: dw_latex.pp
===================================================================
--- dw_latex.pp	(revision 20081)
+++ dw_latex.pp	(working copy)
@@ -79,7 +79,6 @@
     procedure EndOverview; override;
     procedure WriteOverviewMember(const ALabel,AName,Access,ADescr : String); override;
     procedure WriteOverviewMember(const ALabel,AName,ADescr : String); override;
-    Class Function FileNameExtension : String; override;
     // Description node conversion
     procedure DescrBeginBold; override;
     procedure DescrEndBold; override;
@@ -131,6 +130,8 @@
     // TFPDocWriter class methods
     Function InterPretOption(Const Cmd,Arg : String) : boolean; override;
     Property ImageDir : String Read FImageDir Write FImageDir;
+  public
+    Class Function FileNameExtension : String; override;
   end;
 
 
Index: dw_linrtf.pp
===================================================================
--- dw_linrtf.pp	(revision 20081)
+++ dw_linrtf.pp	(working copy)
@@ -114,7 +114,6 @@
     procedure WriteOverviewMember(const ALabel,AName,Access,ADescr : String); override;
     procedure WriteOverviewMember(const ALabel,AName,ADescr : String); override;
     procedure EndOverview; override;
-    Class Function FileNameExtension : String; override;
     // Description node conversion
     procedure DescrBeginBold; override;
     procedure DescrEndBold; override;
@@ -162,6 +161,8 @@
     procedure DescrEndTableCell; override;
     // TFPDocWriter class methods
     Function InterPretOption(Const Cmd,Arg : String) : boolean; override;
+  public
+    Class Function FileNameExtension : String; override;
   end;
 
 
Index: dw_lintmpl.pp
===================================================================
--- dw_lintmpl.pp	(revision 20081)
+++ dw_lintmpl.pp	(working copy)
@@ -91,7 +91,6 @@
     procedure EndOverview; override;
     procedure WriteOverviewMember(const ALabel,AName,Access,ADescr : String); override;
     procedure WriteOverviewMember(const ALabel,AName,ADescr : String); override;
-    Class Function FileNameExtension : String; override;
     // Description node conversion. Overrides for TFPDocWriter.
     procedure DescrBeginBold; override;
     procedure DescrEndBold; override;
@@ -139,6 +138,8 @@
     procedure DescrEndTableCell; override;
     // TFPDocWriter class methods
     Function InterPretOption(Const Cmd,Arg : String) : boolean; override;
+  public
+    Class Function FileNameExtension : String; override;
     Class procedure Usage(List: TStrings); override;
   end;
 
Index: dw_man.pp
===================================================================
--- dw_man.pp	(revision 20081)
+++ dw_man.pp	(working copy)
@@ -97,7 +97,6 @@
     procedure WriteCommentLine;
     procedure WriteComment(Comment : String);
     Procedure WriteExampleFile(FN : String); virtual;
-    Class Function FileNameExtension : String;virtual;
     procedure WriteExample(ADocNode: TDocNode);
     procedure WriteSeeAlso(ADocNode: TDocNode; Comma : Boolean);
   Public
@@ -178,6 +177,7 @@
     procedure DescrBeginTableCell; override;
     procedure DescrEndTableCell; override;
     Function InterPretOption(Const Cmd,Arg : String) : boolean; override;
+    Class Function FileNameExtension : String; override;
     Class procedure Usage(List: TStrings); override;
   end;
 
Index: dw_template.pp
===================================================================
--- dw_template.pp	(revision 20081)
+++ dw_template.pp	(working copy)
@@ -161,7 +161,7 @@
     // Provide feedback about usage of this backend.
     Class procedure Usage(List: TStrings); override;
     // For info only. See linear writer for an example.
-    Class Function FileNameExtension : String;virtual;
+    Class Function FileNameExtension : String; override;
   end;
 
 implementation
Index: dw_txt.pp
===================================================================
--- dw_txt.pp	(revision 20081)
+++ dw_txt.pp	(working copy)
@@ -82,7 +82,6 @@
     procedure EndOverview; override;
     procedure WriteOverviewMember(const ALabel,AName,Access,ADescr : String); override;
     procedure WriteOverviewMember(const ALabel,AName,ADescr : String); override;
-    Class Function FileNameExtension : String; override;
     // Description node conversion
     procedure DescrBeginBold; override;
     procedure DescrEndBold; override;
@@ -130,6 +129,7 @@
     procedure DescrEndTableCell; override;
   Public
     Constructor Create(APackage: TPasPackage; AEngine: TFPDocEngine); override;
+    Class Function FileNameExtension : String; override;
     Class Procedure Usage(List : TStrings) ; override;
     Function InterpretOption(Const Cmd,Arg : String) : Boolean; override;
   end;
Index: dwlinear.pp
===================================================================
--- dwlinear.pp	(revision 20081)
+++ dwlinear.pp	(working copy)
@@ -85,7 +85,6 @@
     procedure StartUnitOverview(AModuleName,AModuleLabel : String);virtual; Abstract;
     procedure WriteUnitEntry(UnitRef : TPasType);virtual; Abstract;
     procedure EndUnitOverview; virtual; Abstract;
-    Class Function FileNameExtension : String;virtual; Abstract;
     Property LastURL : DomString Read FLastURL Write FLastURL;
   Public
     Constructor Create(APackage: TPasPackage; AEngine: TFPDocEngine); override;
Index: dwriter.pp
===================================================================
--- dwriter.pp	(revision 20081)
+++ dwriter.pp	(working copy)
@@ -160,6 +160,7 @@
     Property ImageExtension : String Read FImgExt Write FImgExt;
     // Should return True if option was succesfully interpreted.
     Function InterpretOption(Const Cmd,Arg : String) : Boolean; Virtual;
+    Class Function FileNameExtension : String; virtual;
     Class Procedure Usage(List : TStrings); virtual;
     procedure WriteDoc; virtual; Abstract;
     Function WriteDescr(Element: TPasElement) : TDocNode;
@@ -350,6 +351,12 @@
   Result:=False;
 end;
 
+class function TFPDocWriter.FileNameExtension: String;
+begin
+//Override in linear writers with the expected extension.
+  Result := ''; //Output must not contain an extension.
+end;
+
 Class procedure TFPDocWriter.Usage(List: TStrings);
 begin
   // Do nothing.