diff --git a/src/coreclr/src/inc/clrconfig.h b/src/coreclr/src/inc/clrconfig.h
index 7ffa854353510..bd5e41cdbc0ae 100644
--- a/src/coreclr/src/inc/clrconfig.h
+++ b/src/coreclr/src/inc/clrconfig.h
@@ -41,16 +41,6 @@ class CLRConfig
         IgnoreEnv = 0x1,
         // If set, do not prepend "COMPlus_" when doing environment variable lookup.
         DontPrependCOMPlus_ = 0x2,
-        // If set, don't look in HKLM in the registry.
-        IgnoreHKLM = 0x4,
-        // If set, don't look in HKCU in the registry.
-        IgnoreHKCU = 0x8,
-        // If set, look only in the system config file, ignoring other config files.
-        // (This option does not affect environment variable and registry lookups)
-        ConfigFile_SystemOnly = 0x40,
-        // If set, reverse the order of config file lookups (application config file first).
-        // (This option does not affect environment variable and registry lookups)
-        ConfigFile_ApplicationFirst = 0x80,
         // Remove any whitespace at beginning and end of value.  (Only applicable for
         // *string* configuration values.)
         TrimWhiteSpaceFromStringValue = 0x100,
diff --git a/src/coreclr/src/inc/clrconfigvalues.h b/src/coreclr/src/inc/clrconfigvalues.h
index 44e08eef3ba41..3186372d8d43d 100644
--- a/src/coreclr/src/inc/clrconfigvalues.h
+++ b/src/coreclr/src/inc/clrconfigvalues.h
@@ -780,7 +780,6 @@ CONFIG_DWORD_INFO_DIRECT_ACCESS(INTERNAL_GenerateLongJumpDispatchStubRatio, W("G
 CONFIG_DWORD_INFO_EX(INTERNAL_HashStack, W("HashStack"), 0, "", CLRConfig::EEConfig_default)
 CONFIG_DWORD_INFO(INTERNAL_HostManagerConfig, W("HostManagerConfig"), (DWORD)-1, "")
 CONFIG_DWORD_INFO(INTERNAL_HostTestThreadAbort, W("HostTestThreadAbort"), 0, "")
-RETAIL_CONFIG_DWORD_INFO_EX(UNSUPPORTED_IgnoreDllMainReturn, W("IgnoreDllMainReturn"), 0, "Don't check the return value of DllMain if this is set", CLRConfig::ConfigFile_ApplicationFirst)
 CONFIG_STRING_INFO(INTERNAL_InvokeHalt, W("InvokeHalt"), "Throws an assert when the given method is invoked through reflection.")
 CONFIG_DWORD_INFO_DIRECT_ACCESS(INTERNAL_MaxStackDepth, W("MaxStackDepth"), "")
 CONFIG_DWORD_INFO_DIRECT_ACCESS(INTERNAL_MaxStubUnwindInfoSegmentSize, W("MaxStubUnwindInfoSegmentSize"), "")
diff --git a/src/coreclr/src/utilcode/clrconfig.cpp b/src/coreclr/src/utilcode/clrconfig.cpp
index 12e7f9db5218a..5142e395ac0ec 100644
--- a/src/coreclr/src/utilcode/clrconfig.cpp
+++ b/src/coreclr/src/utilcode/clrconfig.cpp
@@ -82,43 +82,6 @@
 #undef CONFIG_STRING_INFO_DIRECT_ACCESS
 
 
-
-
-// Return if a quirk is a enabled.
-// This will also return enabled as true when the quirk has a value set.
-BOOL CLRConfig::IsConfigEnabled(const ConfigDWORDInfo & info)
-{
-    CONTRACTL
-    {
-        NOTHROW;
-        GC_NOTRIGGER;
-        FORBID_FAULT;
-    }
-    CONTRACTL_END;
-
-    DWORD result = info.defaultValue;
-
-    //
-    // Set up REGUTIL options.
-    //
-    REGUTIL::CORConfigLevel level = GetConfigLevel(info.options);
-    BOOL prependCOMPlus = !CheckLookupOption(info, DontPrependCOMPlus_);
-
-    REGUTIL::GetConfigDWORD_DontUse_(info.name, info.defaultValue, &result, level, prependCOMPlus);
-    if(result>0)
-        return TRUE;
-    LPWSTR result2 = REGUTIL::GetConfigString_DontUse_(info.name, prependCOMPlus, level);
-    if(result2 != NULL && result2[0] != 0)
-    {
-        return TRUE;
-    }
-
-    if(info.defaultValue>0)
-        return TRUE;
-    else
-        return FALSE;
-}
-
 //
 // Look up a DWORD config value.
 //
@@ -418,11 +381,5 @@ REGUTIL::CORConfigLevel CLRConfig::GetConfigLevel(LookupOptions options)
     if(CheckLookupOption(options, IgnoreEnv) == FALSE)
         level = static_cast<REGUTIL::CORConfigLevel>(level | REGUTIL::COR_CONFIG_ENV);
 
-    if(CheckLookupOption(options, IgnoreHKCU) == FALSE)
-        level = static_cast<REGUTIL::CORConfigLevel>(level | REGUTIL::COR_CONFIG_USER);
-
-    if(CheckLookupOption(options, IgnoreHKLM) == FALSE)
-        level = static_cast<REGUTIL::CORConfigLevel>(level | REGUTIL::COR_CONFIG_MACHINE);
-
-    return level;
+    return static_cast<REGUTIL::CORConfigLevel>(level | REGUTIL::COR_CONFIG_USER | REGUTIL::COR_CONFIG_MACHINE);
 }