diff --git a/slic3r/GUI/GUI_App.cpp b/slic3r/GUI/GUI_App.cpp
index 09dc930..dfc5be9 100644
--- a/slic3r/GUI/GUI_App.cpp
+++ b/slic3r/GUI/GUI_App.cpp
@@ -788,7 +788,7 @@ static const FileWildcards file_wildcards_by_type[FT_SIZE] = {
     /* FT_MODEL */
     {"Supported files"sv, {".3mf"sv, ".stl"sv, ".oltp"sv, ".stp"sv, ".step"sv, ".svg"sv, ".amf"sv, ".obj"sv}},
 #endif
-    /* FT_PROJECT */ { "Project files"sv,   { ".3mf"sv,"*.*"sv}},
+    /* FT_PROJECT */ { "Project files"sv,   { ".3mf"sv,".stl"sv}},
     /* FT_GALLERY */ { "Known files"sv,     { ".stl"sv, ".obj"sv } },
 
     /* FT_INI */     { "INI files"sv,       { ".ini"sv } },