Now that we've decided on a file extension for private key files

(.PPK), make it the default in all the private-key file dialogs.

[originally from svn r1808]

pageant.c

@@ -1240,7 +1240,7 @@ static void prompt_add_keyfile(void)
     of.lStructSize = sizeof(of);
 #endif
     of.hwndOwner = main_hwnd;
-    of.lpstrFilter = "All Files\0*\0\0\0";
+    of.lpstrFilter = "PuTTY Private Key Files\0*.PPK\0AllFiles\0*\0\0\0";
     of.lpstrCustomFilter = NULL;
     of.nFilterIndex = 1;
     of.lpstrFile = filelist;

puttygen.c

@@ -182,7 +182,7 @@ static int prompt_keyfile(HWND hwnd, char *dlgtitle,
     of.lStructSize = sizeof(of);
 #endif
     of.hwndOwner = hwnd;
-    of.lpstrFilter = "All Files\0*\0\0\0";
+    of.lpstrFilter = "PuTTY Private Key Files\0*.PPK\0AllFiles\0*\0\0\0";
     of.lpstrCustomFilter = NULL;
     of.nFilterIndex = 1;
     of.lpstrFile = filename;
@@ -190,6 +190,7 @@ static int prompt_keyfile(HWND hwnd, char *dlgtitle,
     of.nMaxFile = FILENAME_MAX;
     of.lpstrFileTitle = NULL;
     of.lpstrInitialDir = NULL;
+    of.lpstrDefExt = ".ppk";
     of.lpstrTitle = dlgtitle;
     of.Flags = 0;
     if (save)

windlg.c

@@ -3133,7 +3133,8 @@ static int GenericMainDlgProc(HWND hwnd, UINT msg,
 		of.lStructSize = sizeof(of);
 #endif
 		of.hwndOwner = hwnd;
-		of.lpstrFilter = "All Files\0*\0\0\0";
+		of.lpstrFilter = "PuTTY Private Key Files\0*.PPK\0"
+		    "AllFiles\0*\0\0\0";
 		of.lpstrCustomFilter = NULL;
 		of.nFilterIndex = 1;
 		of.lpstrFile = filename;