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wiki-rtd/docs/wiki_experiments/external-emulator/external-emulator.md
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# Launching External Emulators
This experiment was initiated by the user **TopHatCat:** and later expanded upon by the RetroDECK Team. The goal was to explore the possibility of launching desktop games and apps within RetroDECK.
This experiment was initiated by the user **TopHatCat:** and later expanded upon by the RetroDECK Team. The goal was to explore the possibility of launching external emulators games and via RetroDECK of ES-DE supported systems.
The main downside of this is that you are getting none of the RetroDECK Features for these emulator: Hotkeys, Configurator, Unified Folders, Backups etc.. etc...
You are bound by each emulators defaults and you will need to personally change them to your liking.
### Disclaimer on Experiments
@ -23,31 +27,31 @@ flatpak override --user --talk-name=org.freedesktop.Flatpak net.retrodeck.retrod
### Add RetroDECK to Steam
We also recommend that you add RetroDECK to Steam to utilize Steam Input as there is a higher chance of inputs working from the external source.
We also recommend that you add RetroDECK to Steam to utilize Steam Input if you need to rebind the emulators hotkeys manually.
Also some RetroDECK built-in hotkeys in the radials like `Alt+F4` might help you close windows.
## Folder Structure
##
Depending how you installed RetroDECK the Flatpak paths are different.
You can either install it as a system or user application.
| Type | Folder | Comment |
| :---: | :---: | :---: |
| **User Application:** ES-DE Linux Folder |`~/.local/share/flatpak/app/net.retrodeck.retrodeck/current/active/files/share/es-de/resources/systems/linux/` | `es_find_rules.xml` `es_systems.xml` |
| **System Application:** ES-DE Linux Folder |`/var/lib/flatpak/app/net.retrodeck.retrodeck/current/active/files/share/es-de/resources/systems/linux/` | `es_find_rules.xml` `es_systems.xml` |
## How-to add an Flathub installed Emulator
To add external emulators to retrodeck:
1. Go to the ES-DE Linux Folder via the path above (depending how you installed RetroDECK).
2. Find and open `es_find_rules.xml` (if you have RetroDECK installed as a System Application, you will need more permissions).
3. At the end of file add a new ruleset
Go to your root directory and search for the file es_systems.xml through your whole system.
There will be multiple copies, go to the one in a dir called "Linux". Go to the directory, not the file specifically.
Next to es_systems.xml is es_find_rules.xml. open that file. This will have commands to run different emulators.
Add a new emulator with whichever name you want that has a system path rule with only one entry of flatpak-spawn, but you have to remember that name. This is merely a bridge.
My example:
```
xml
<emulator name="HOST">
<rule type="systempath">
<entry>flatpak-spawn</entry>
</rule>
</emulator>
```