diff -r ec32dd185d80 -r 80d56f1d58fe extensions/cstrike/extension.cpp
--- a/extensions/cstrike/extension.cpp	Sat May 24 03:04:10 2008 +0000
+++ b/extensions/cstrike/extension.cpp	Sat May 24 04:08:29 2008 +0000
@@ -54,6 +54,12 @@
 
 bool CStrike::SDK_OnLoad(char *error, size_t maxlength, bool late)
 {
+	if (strcmp(g_pSM->GetGameFolderName(), "cstrike") != 0)
+	{
+		snprintf(error, maxlength, "Cannot Load Cstrike Extension on mods other than CS:S");
+		return false;
+	}
+
 	sharesys->AddDependency(myself, "bintools.ext", true, true);
 
 	char conf_error[255];