What game tho?
This typical adding game on JoiPlay
add game select game folder (the game you want to play), pick .exe file
View attachment 4352588
that for rpgm file (VX, Ace, MV, MZ)
for renpy you can choice.exe or .ph or other been while since I add renpy
My collection after deleting some games
View attachment 4352607
so basically on rpgm, renpy, html games you download windows ver. Extract it if it on compression file (.zip .rar or such). Pick add game on JoiPlay, select [insert here game you want to add] folder, pick .exe then just finish it.
if you have apk file why bother open it on JoiPlay? just click those apk file to install the game like typical android apk.