Say what file extension is expected from dump file

include/core/advdumper.hpp

@@ -55,6 +55,13 @@ public:
  * Returns: Mode details flags
  */
 	virtual unsigned mode_details(const std::string& mode) throw() = 0;
+/**
+ * Get mode extensions. Only called if mode details specifies that output is a single file.
+ *
+ * parameter mode: The submode.
+ * Returns: Mode extension
+ */
+	virtual std::string mode_extension(const std::string& mode) throw() = 0;
 /**
  * Get human-readable name for this dumper.
  *

src/platform/wxwidgets/dumpmenu.cpp

@@ -118,6 +118,8 @@ void dumper_menu::on_select(wxCommandEvent& e)
 			std::string prefix;
 			if((d & adv_dumper::target_type_mask) == adv_dumper::target_type_file) {
 				wxFileDialog* d = new wxFileDialog(pwin, wxT("Choose file"), wxT("."));
+				std::string modext = t->mode_extension(mode);
+				d->SetWildcard(towxstring(modext + " files|*." + modext));
 				if(d->ShowModal() == wxID_OK)
 					prefix = tostdstring(d->GetPath());
 				d->Destroy();

src/video/avi.cpp

@@ -426,6 +426,12 @@ again:
 			return target_type_prefix;
 		}
 
+		std::string mode_extension(const std::string& mode) throw()
+		{
+			return "";	//Not interesting
+		}
+
+
 		std::string name() throw(std::bad_alloc)
 		{
 			return "AVI (internal)";

src/video/jmd.cpp

@@ -342,6 +342,11 @@ namespace
 			return (mode == "tcp") ? target_type_special : target_type_file;
 		}
 
+		std::string mode_extension(const std::string& mode) throw()
+		{
+			return "jmd";	//Ignored if tcp mode.
+		}
+
 		std::string name() throw(std::bad_alloc)
 		{
 			return "JMD";

src/video/pipedec.cpp

@@ -243,6 +243,11 @@ namespace
 			return target_type_file;
 		}
 
+		std::string mode_extension(const std::string& mode) throw()
+		{
+			return "sox";
+		}
+
 		std::string name() throw(std::bad_alloc)
 		{
 			return "PIPEDEC";

src/video/raw.cpp

@@ -162,6 +162,11 @@ namespace
 			return IS_TCP(strhash(mode)) ? target_type_special : target_type_prefix;
 		}
 
+		std::string mode_extension(const std::string& mode) throw()
+		{
+			return "";	//Nothing interesting.
+		}
+
 		std::string name() throw(std::bad_alloc)
 		{
 			return "RAW";

src/video/sdmp.cpp

@@ -163,6 +163,11 @@ namespace
 			return target_type_mask;
 		}
 
+		std::string mode_extension(const std::string& mode) throw()
+		{
+			return "sdmp";	//Ignored anyway in non-ss mode.
+		}
+
 		std::string name() throw(std::bad_alloc)
 		{
 			return "SDMP";