I've got a separate script that downloads/filters/merges multiple RSS feeds into a single local xml file.
Trying to add an RSS feed in Tixati with a file:// handler fails to retrieve the feed.
Starting test...
  
Downloading feed items from:
  file:///D:/Download/rss/rss.xml
Waiting to connect...
Resolving...
    ERROR: Host not found (49410)
  
Downloading feed items from:
  file://localhost/D:/Download/rss/rss.xml
Waiting to connect...
Resolving...
Connecting...
Sending request...
Waiting for reply...
    ERROR: server responded with code 404
  
No feed items were obtained from the given URLs.
  
Test stopped
 
Using v2.43 x64 on Windows 10 x64