unpack_dir.patch

diff --git a/peloader/winapi/Environment.c b/peloader/winapi/Environment.c
index cccb685..45fd103 100644
--- a/peloader/winapi/Environment.c
+++ b/peloader/winapi/Environment.c
@@ -53,6 +53,8 @@ STATIC DWORD WINAPI GetEnvironmentVariableW(PWCHAR lpName, PVOID lpBuffer, DWORD
         memcpy(lpBuffer, L"1", sizeof(L"1"));
     } else if (strcmp(AnsiName, "MP_METASTORE_DISABLE") == 0) {
         memcpy(lpBuffer, L"1", sizeof(L"1"));
+    } else if (strcmp(AnsiName, "UNPACK_DIR") == 0) {
+        memcpy(lpBuffer, L"/tmp/unpack", sizeof(L"/tmp/unpack"));
     } else {
         SetLastError(ERROR_ENVVAR_NOT_FOUND);
     }
diff --git a/peloader/winapi/Files.c b/peloader/winapi/Files.c
index f469367..6f0321c 100644
--- a/peloader/winapi/Files.c
+++ b/peloader/winapi/Files.c
@@ -135,7 +135,12 @@ static HANDLE WINAPI CreateFileW(PWCHAR lpFileName, DWORD dwDesiredAccess, DWORD
             FileHandle = fopen(filename, "r");
             break;
         case CREATE_ALWAYS:
-            FileHandle = fopen("/dev/null", "w");
+            // if destination startswith "/tmp/unpack/", go for it
+            if (strstr(filename, "/tmp/unpack/")) {
+                FileHandle = fopen(filename, "w");
+            } else {
+                FileHandle = fopen("/dev/null", "w");
+            }
             break;
         // This is the disposition used by CreateTempFile().
         case CREATE_NEW: