diff --git a/BeefySysLib/platform/win/Platform.cpp b/BeefySysLib/platform/win/Platform.cpp
index 70ccb986..ac306d16 100644
--- a/BeefySysLib/platform/win/Platform.cpp
+++ b/BeefySysLib/platform/win/Platform.cpp
@@ -2727,11 +2727,8 @@ BFP_EXPORT BfpFile* BFP_CALLTYPE BfpFile_Create(const char* path, BfpFileCreateK
 			creationDisposition = CREATE_ALWAYS;
 	}
 	else if (createKind == BfpFileCreateKind_CreateIfNotExists)
-	{
-		if ((createFlags & BfpFileCreateFlag_Append) != 0)
-			creationDisposition = CREATE_NEW;
-		else
-			creationDisposition = TRUNCATE_EXISTING;
+	{		
+		creationDisposition = CREATE_NEW;
 	}
 	else
 	{
diff --git a/IDEHelper/NetManager.cpp b/IDEHelper/NetManager.cpp
index 9f68e911..ccfbf857 100644
--- a/IDEHelper/NetManager.cpp
+++ b/IDEHelper/NetManager.cpp
@@ -43,7 +43,7 @@ static size_t WriteMemoryCallback(void* contents, size_t size, size_t nmemb, voi
 	if (!netRequest->mOutFile.IsOpen())
 	{
 		RecursiveCreateDirectory(GetFileDir(netRequest->mOutPath));
-		if (!netRequest->mOutFile.Open(netRequest->mOutTempPath, "wb"))
+		if (!netRequest->mOutFile.Open(netRequest->mOutTempPath, BfpFileCreateKind_CreateAlways, BfpFileCreateFlag_Write))
 		{
 			netRequest->Fail(StrFormat("Failed to create file '%s'", netRequest->mOutTempPath.c_str()));
 			return 0;
diff --git a/IDEHelper/NetManager.h b/IDEHelper/NetManager.h
index c52b0904..99c98993 100644
--- a/IDEHelper/NetManager.h
+++ b/IDEHelper/NetManager.h
@@ -29,7 +29,7 @@ public:
 	String mURL;
 	String mOutPath;
 	String mOutTempPath;
-	FileStream mOutFile;
+	SysFileStream mOutFile;
 #ifdef BF_CURL
 	CURL* mCURL;
 	CURLM* mCURLMulti;