Flycast Guide

Supported ROM Formats

Flycast supports the following game formats:

SEGA Dreamcast Titles: .cdi, .gdi, .chd, .cue (includes Windows CE games)
SEGA NAOMI GD-ROM Titles: .7z, .zip, .dat/.lst, .chd
SEGA NAOMI 1 & 2 Titles: .zip, .7z, .dat/.lst
Sammy Atomiswave Titles: .zip, .7z

Note: Flycast does not support Hikaru or SEGA System SP games.

Prepare Files:
- Get the Flycast .appx file (e.g., flycast_2.5.appx).
- (Optional) Get a Dreamcast BIOS (dc_boot) file for better compatibility.
Upload BIOS to USB (optional but recommended):
- Create a Sega - Dreamcast games folder on your USB.
- Place the BIOS file and Dreamcast games inside.
Install Flycast:
- Enable Xbox Device Portal in your Xbox Dev Mode settings.
- On your PC, open a web browser and enter the Xbox Device Portal URL.
- Go to My games & apps → Add.
- Drag and drop the Flycast .appx file, click Next, then Start.
- Once installed, click Done.
Change App to Game Mode:
- On Xbox, hover over Flycast → press Select → View Details.
- Change it from App to Game.

Where to upload your ROMs:

Xbox Device Portal → File explorer → LocalAppData\Flycast\LocalState
- Create a games folder here.
- Upload Dreamcast ROMs.
- You can upload .zip files — the portal will prompt you to unzip.

For cheats, VMUs, etc.:

Launch Flycast.
Go to Settings → Content Location → Add.
Press Up on the D-pad → A → keep pressing A on .. (Parent Directory) until you see drives.
Select the E:/ drive (USB)
If using internal storage the default drive will be Q:/.
Press B → Select Current Directory.