diff --git a/pytorrent/services/rtorrent/files.py b/pytorrent/services/rtorrent/files.py
index 8653c97..4315880 100644
--- a/pytorrent/services/rtorrent/files.py
+++ b/pytorrent/services/rtorrent/files.py
@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 from .client import *
+from ...config import BASE_DIR
 
 def torrent_files(profile: dict, torrent_hash: str) -> list[dict]:
     rows = client_for(profile).f.multicall(torrent_hash, "", "f.path=", "f.size_bytes=", "f.completed_chunks=", "f.size_chunks=", "f.priority=")
@@ -131,6 +132,7 @@ _MEDIA_INFO_EXTENSIONS = {
 }
 _MEDIA_INFO_SAMPLE_BYTES = 32 * 1024 * 1024
 _MEDIA_INFO_CHUNK_BYTES = 1024 * 1024
+_MEDIA_INFO_TMP_DIR = BASE_DIR / "data" / "media-info-samples"
 
 
 def _media_info_supported(path: str) -> bool:
@@ -138,11 +140,23 @@ def _media_info_supported(path: str) -> bool:
     return LocalPath(str(path or "")).suffix.lower() in _MEDIA_INFO_EXTENSIONS
 
 
+def _media_info_sample_suffix(source_path: str) -> str:
+    suffix = LocalPath(str(source_path or "")).suffix.lower()
+    if suffix and len(suffix) <= 16 and all(ch.isalnum() or ch in ".-_" for ch in suffix):
+        return suffix
+    return ".bin"
+
+
 def _media_info_temp_sample(profile: dict, source_path: str, max_bytes: int) -> tuple[str, int]:
-    # Note: hachoir needs a seekable file, so this writes a bounded sample to disk instead of loading whole media into RAM.
+    # Note: hachoir needs a seekable file, so this writes a bounded sample into the app data directory instead of loading whole media into RAM.
     import tempfile
 
-    fd, tmp_path = tempfile.mkstemp(prefix="pytorrent-mediainfo-", suffix=LocalPath(source_path).suffix)
+    _MEDIA_INFO_TMP_DIR.mkdir(parents=True, exist_ok=True)
+    fd, tmp_path = tempfile.mkstemp(
+        prefix="pytorrent-mediainfo-",
+        suffix=_media_info_sample_suffix(source_path),
+        dir=str(_MEDIA_INFO_TMP_DIR),
+    )
     written = 0
     try:
         with os.fdopen(fd, "wb") as tmp:
@@ -283,7 +297,8 @@ def torrent_file_media_info(profile: dict, torrent_hash: str, index: int, max_by
     tmp_path = None
     try:
         tmp_path, written = _media_info_temp_sample(profile, remote_path, max(1024 * 1024, int(max_bytes)))
-        parser = createParser(tmp_path, real_filename=LocalPath(name).name)
+        # Note: Do not pass real_filename here; some hachoir versions treat it as an input path and fail for nested torrent file names.
+        parser = createParser(tmp_path)
         if parser is None:
             result.update({"sample_bytes": written, "error": "hachoir could not detect this media container."})
             return result