diff --git a/src/cpp/lpnamer/problem_modifier/FileWriter.cpp b/src/cpp/lpnamer/problem_modifier/FileWriter.cpp
index ee359f9de..e94b7c1f1 100644
--- a/src/cpp/lpnamer/problem_modifier/FileWriter.cpp
+++ b/src/cpp/lpnamer/problem_modifier/FileWriter.cpp
@@ -6,11 +6,7 @@
 #include "antares-xpansion/lpnamer/problem_modifier/LinkProblemsGenerator.h"
 
 void FileWriter::Write_problem(Problem *in_prblm, const std::filesystem::path &output_file) {
-  if (output_file.extension() == ".mps") {
-    in_prblm->write_prob_mps(output_file);
-  } else {
-    in_prblm->save_prob(output_file);
-  }
+  in_prblm->save_prob(output_file);
 }
 
 FileWriter::FileWriter(std::filesystem::path lp_dir)
diff --git a/src/cpp/lpnamer/problem_modifier/MasterGeneration.cpp b/src/cpp/lpnamer/problem_modifier/MasterGeneration.cpp
index b52e9610e..549ce52db 100644
--- a/src/cpp/lpnamer/problem_modifier/MasterGeneration.cpp
+++ b/src/cpp/lpnamer/problem_modifier/MasterGeneration.cpp
@@ -51,10 +51,10 @@ void MasterGeneration::write_master_mps(
   master_problem._name = "master";
   switch (save_mode_) {
     case SaveMode::MPS:
-      master_problem.write_prob_mps(rootPath / "lp" / "master");
+      master_problem.write_prob_mps(rootPath / "lp" / "master.mps");
       break;
     case SaveMode::SAVE:
-      master_problem.save_prob(rootPath / "lp" / "master");
+      master_problem.save_prob(rootPath / "lp" / "master.svf");
       break;
     default:
         throw std::runtime_error("Unknown save mode " + std::to_string(static_cast<int>(save_mode_)));
diff --git a/src/cpp/lpnamer/problem_modifier/XpansionProblemsFromAntaresProvider.cpp b/src/cpp/lpnamer/problem_modifier/XpansionProblemsFromAntaresProvider.cpp
index 2ad25a053..53757ff32 100644
--- a/src/cpp/lpnamer/problem_modifier/XpansionProblemsFromAntaresProvider.cpp
+++ b/src/cpp/lpnamer/problem_modifier/XpansionProblemsFromAntaresProvider.cpp
@@ -25,7 +25,6 @@ XpansionProblemsFromAntaresProvider::provideProblems(
         AntaresProblemToXpansionProblemTranslator::translateToXpansionProblem(
             antares_hebdo_problems, problem_id.year, problem_id.week,
             solver_name, solver_log_manager);
-    problem->_name = std::filesystem::path(problem->_name).replace_extension(".svf");
     xpansion_problems.push_back(problem);
   }
   return xpansion_problems;
diff --git a/src/cpp/multisolver_interface/SolverCbc.cpp b/src/cpp/multisolver_interface/SolverCbc.cpp
index 50f1baddc..f4cef4048 100644
--- a/src/cpp/multisolver_interface/SolverCbc.cpp
+++ b/src/cpp/multisolver_interface/SolverCbc.cpp
@@ -143,8 +143,8 @@ void SolverCbc::write_prob_mps(const std::filesystem::path &filename) {
   if (filename_to_use.extension() != ".mps") {
     filename_to_use.replace_extension(".mps");
   }
-  writer.writeMps(filename_to_use.string().c_str(), 0 /*gzip it*/, 1, 1, nullptr, 0,
-                  nullptr);
+  writer.writeMps(filename_to_use.string().c_str(), 0 /*gzip it*/, 1, 1,
+                  nullptr, 0, nullptr);
 }
 
 void SolverCbc::write_prob_lp(const std::filesystem::path &filename) {
@@ -186,8 +186,14 @@ void SolverCbc::setClpSimplexRowNamesFromInnerSolver(ClpSimplex *clps) const {
 }
 
 void SolverCbc::read_prob_mps(const std::filesystem::path &prob_name) {
-  int status = _clp_inner_solver.readMps(prob_name.string().c_str());
-  zero_status_check(status, " read problem "s + prob_name.string(),
+  auto filename_to_use = prob_name;
+  if (filename_to_use.extension() != ".mps") {
+    filename_to_use.replace_extension(".mps");
+  }
+  int status = _clp_inner_solver.readMps(filename_to_use.string().c_str());
+  zero_status_check(status,
+                    " read problem "s + prob_name.string() + " , filename : "s +
+                        filename_to_use.string(),
                     LOGLOCATION);
   defineCbcModelFromInnerSolver();
 }
diff --git a/src/cpp/multisolver_interface/SolverClp.cpp b/src/cpp/multisolver_interface/SolverClp.cpp
index c392b6660..0f84f0c04 100644
--- a/src/cpp/multisolver_interface/SolverClp.cpp
+++ b/src/cpp/multisolver_interface/SolverClp.cpp
@@ -88,8 +88,12 @@ void SolverClp::write_basis(const std::filesystem::path &filename) {
 }
 
 void SolverClp::read_prob_mps(const std::filesystem::path &filename) {
-  int status = _clp.readMps(filename.string().c_str(), true, false);
-  zero_status_check(status, " Clp readMps "s + filename.string(), LOGLOCATION);
+  auto filename_to_use = filename;
+  if (filename_to_use.extension() != ".mps") {
+    filename_to_use.replace_extension(".mps");
+  }
+  int status = _clp.readMps(filename_to_use.string().c_str(), true, false);
+  zero_status_check(status, " Clp readMps "s + filename_to_use.string(), LOGLOCATION);
 }
 
 void SolverClp::read_prob_lp(const std::filesystem::path &filename) {