diff --git a/libraries/lib-project-file-io/ProjectFileIO.cpp b/libraries/lib-project-file-io/ProjectFileIO.cpp
index c5383f546..0ace696a4 100644
--- a/libraries/lib-project-file-io/ProjectFileIO.cpp
+++ b/libraries/lib-project-file-io/ProjectFileIO.cpp
@@ -774,10 +774,12 @@ bool ProjectFileIO::CheckVersion()
 
    // Project file version is higher than ours. We will refuse to
    // process it since we can't trust anything about it.
-   if (SupportedProjectFormatVersion < version)
+   // TODO: use the SupportedProjectFormatVersion instead and make a way to
+   // clearly distinguish projects created by either Audacity or Tenacity.
+   if (SupportedAudacityProjectFormatVersion < version)
    {
       SetError(
-         XO("This project was created with a newer version of Audacity.\n\nYou will need to upgrade to open it.")
+         XO("This project was created with a version of Audacity that is not supported by Tenacity.\n\nYou will need to use that version to open it.")
       );
       return false;
    }
@@ -785,8 +787,8 @@ bool ProjectFileIO::CheckVersion()
       using namespace BasicUI;
       wxString currentVersionStr = wxString::Format("%u.%u", BaseProjectFormatVersion.Major, BaseProjectFormatVersion.Minor);
       bool updateVersion = (MessageBoxResult::Yes == ShowMessageBox(
-         XO("This project was created using an older Audacity version. "
-            "Once saved, the project can only be opened with Audacity version %s or newer.").Format(currentVersionStr),
+         XO("This project was created using an older Tenacity version. "
+            "Once saved, the project can only be opened with Tenacity version %s or newer.").Format(currentVersionStr),
          MessageBoxOptions{}
             .Caption(XO("Project update required"))));
    }
diff --git a/libraries/lib-project/ProjectFormatVersion.cpp b/libraries/lib-project/ProjectFormatVersion.cpp
index be8da409a..03dcb54ee 100644
--- a/libraries/lib-project/ProjectFormatVersion.cpp
+++ b/libraries/lib-project/ProjectFormatVersion.cpp
@@ -50,7 +50,9 @@ bool ProjectFormatVersion::IsValid() const noexcept
 }
 
 const ProjectFormatVersion SupportedProjectFormatVersion = {
-   TENACITY_VERSION, TENACITY_RELEASE, TENACITY_REVISION, 0
+   TENACITY_VERSION, TENACITY_RELEASE, TENACITY_REVISION, 0, true
 };
 
-const ProjectFormatVersion BaseProjectFormatVersion = { TENACITY_VERSION, TENACITY_RELEASE, 0, 0 };
+const ProjectFormatVersion SupportedAudacityProjectFormatVersion = { 3, 7, 0, 0, false };
+const ProjectFormatVersion BaseProjectFormatVersion              = { 1, 3, 0, 0, true  };
+const ProjectFormatVersion BaseAudacityProjectFormatVersion      = { 3, 0, 0, 0, false };
diff --git a/libraries/lib-project/ProjectFormatVersion.h b/libraries/lib-project/ProjectFormatVersion.h
index 2c88353f5..14d987dfc 100644
--- a/libraries/lib-project/ProjectFormatVersion.h
+++ b/libraries/lib-project/ProjectFormatVersion.h
@@ -24,6 +24,7 @@ struct PROJECT_API ProjectFormatVersion final
    uint8_t Minor { 0 };
    uint8_t Revision { 0 };
    uint8_t ModLevel { 0 };
+   bool    IsTenacity { false };
 
    // Create ProjectFormatVersion from the uint32_t value 
    static ProjectFormatVersion FromPacked(uint32_t) noexcept;
@@ -38,7 +39,16 @@ PROJECT_API bool operator==(ProjectFormatVersion lhs, ProjectFormatVersion rhs)
 PROJECT_API bool operator!=(ProjectFormatVersion lhs, ProjectFormatVersion rhs) noexcept;
 PROJECT_API bool operator<(ProjectFormatVersion lhs, ProjectFormatVersion rhs) noexcept;
 
-//! This constant represents the current version of Audacity
+/// This constant represents the current version of Tenacity.
 PROJECT_API extern const ProjectFormatVersion SupportedProjectFormatVersion;
-//! This is a helper constant for the "most compatible" project version which is the current MAJ.MIN.0.0
+
+/// This constant represents the maximum supported Audacity project version.
+PROJECT_API extern const ProjectFormatVersion SupportedAudacityProjectFormatVersion;
+
+/// This is a helper constant for the "most compatible" project version created
+/// by Tenacity with the value (MAJ, MIN, 0, 0).
 PROJECT_API extern const ProjectFormatVersion BaseProjectFormatVersion;
+
+/// This is a helper constant for the "most compatible" project version created
+/// by Audacity with the value {AUD_MAJ, AUD_MIN, 0, 0}.
+PROJECT_API extern const ProjectFormatVersion BaseAudacityProjectFormatVersion;