slightly re-ordered the default files for mupp in the open dialog.

src/musredit_qt5/mupp/PmuppGui.cpp

@@ -638,7 +638,7 @@ void PmuppGui::fileOpen()
          this,
          "muSR Parameter Files",
          "./",
-         "db-files (*.db);; All Params (*.msr *.db *.dat);; Msr-Files (*.msr);; dat-Files (*.dat);; All (*)");
+         "dat-files (*.dat);; db-Files (*.db);; All Params (*.msr *.db *.dat);; Msr-Files (*.msr);; All (*)");
 
   if (list.count() == 0)
     return;

src/musredit_qt6/mupp/PmuppGui.cpp

@@ -637,7 +637,7 @@ void PmuppGui::fileOpen()
          this,
          "muSR Parameter Files",
          "./",
-         "db-files (*.db);; All Params (*.msr *.db *.dat);; Msr-Files (*.msr);; dat-Files (*.dat);; All (*)");
+        "dat-files (*.dat);; db-Files (*.db);; All Params (*.msr *.db *.dat);; Msr-Files (*.msr);; All (*)");
 
   if (list.count() == 0)
     return;