The file extension of Telegram desktop for Windows is exe and the file extension of telegram for android is apk. However, you can also install apk Android app on windows via an Android emulator. Like Nox player, Bluestacks, and many more.
If you are using a telegram desktop for Windows then for now you can only make voice calls. But if you are using the telegram apk app on windows via emulator then you can make both types of calls. Video as well as audio calls easily.
Best app for video calls on android:
There are many video calling apps are available on the Google play store but we suggest you go with Google duo. Google duo is a high-quality video calling app developed by Google itself.
Duo supports up to 32 people together. Duo also supports a cross-platform like android, windows, ios, etc.