diff --git a/dlls/winmm/mmio.c b/dlls/winmm/mmio.c
index cb3175c5cd7..1255cf69da2 100644
--- a/dlls/winmm/mmio.c
+++ b/dlls/winmm/mmio.c
@@ -52,6 +52,7 @@ static WINE_MMIO *MMIOList;
 static HANDLE create_file_OF( LPCSTR path, INT mode )
 {
     DWORD access, sharing, creation;
+    char full_path[MAX_PATH];
 
     if (mode & OF_CREATE)
     {
@@ -79,7 +80,13 @@ static HANDLE create_file_OF( LPCSTR path, INT mode )
     case OF_SHARE_COMPAT:
     default:                  sharing = FILE_SHARE_READ | FILE_SHARE_WRITE; break;
     }
-    return CreateFileA( path, access, sharing, NULL, creation, FILE_ATTRIBUTE_NORMAL, 0 );
+
+    if (mode & OF_CREATE)
+        return CreateFileA( path, access, sharing, NULL, creation, FILE_ATTRIBUTE_NORMAL, 0 );
+
+    if (!SearchPathA( NULL, path, NULL, MAX_PATH, full_path, NULL ))
+        return INVALID_HANDLE_VALUE;
+    return CreateFileA( full_path, access, sharing, NULL, creation, FILE_ATTRIBUTE_NORMAL, 0 );
 }
 
 /**************************************************************************
diff --git a/dlls/winmm/tests/mmio.c b/dlls/winmm/tests/mmio.c
index c9ceda24f3f..a232070064c 100644
--- a/dlls/winmm/tests/mmio.c
+++ b/dlls/winmm/tests/mmio.c
@@ -551,7 +551,7 @@ static void test_mmioOpen_create(void)
 
     wcscpy(buffer, L"test_mmio_path");
     hmmio = mmioOpenW(buffer, &info, MMIO_WRITE);
-    todo_wine ok(!!hmmio, "failed to open file, error %#x\n", info.wErrorRet);
+    ok(!!hmmio, "failed to open file, error %#x\n", info.wErrorRet);
     mmioClose(hmmio, 0);
 
     wcscpy(buffer, L"test_mmio_path");