diff --git a/handlers.go b/handlers.go
index 9d111ad..4e08d9d 100644
--- a/handlers.go
+++ b/handlers.go
@@ -15,7 +15,7 @@ func getResponse(path string) ([]Item, error) {
 	}
 
 	for i := range fileNames {
-		fileNames[i] = strings.TrimPrefix(filepath.ToSlash(fileNames[i]), filepath.ToSlash(config.WorkingDirectory))[1:] // TODO: check is first slash properly removed
+		fileNames[i] = strings.TrimPrefix(filepath.ToSlash(fileNames[i]), filepath.ToSlash(config.WorkingDirectory))
 	}
 
 	items := make([]Item, 0)
diff --git a/preview.go b/preview.go
index 5a5df6b..63548e0 100644
--- a/preview.go
+++ b/preview.go
@@ -60,11 +60,11 @@ func (pc *PreviewCache) Add(filePath string) ([]byte, error) {
 			"-f", "avif",
 			tempFileName)
 	} else {
-		cmd = exec.Command("ffmpeg",
+		cmd = exec.Command("ffmpeg.exe",
 			"-i", filepath.FromSlash(filePath),
 			"-vf", "scale=240:240:force_original_aspect_ratio=increase,crop=240:240:exact=1",
 			"-frames:v", "1",
-			"-crf", strconv.FormatUint(config.Crf, 10),
+			"-crf", "40",
 			"-f", "avif",
 			tempFileName)
 	}