It didn't work :/ But i have an solution! It's not *.ini but *.ipk. In Angry birds and angry birds seasons at "appinfo.json" there is ' "title": "Angry Birds"," and WebOS Manager is using this title to create install folder. That's why it didn't install.

HOW TO INSTALL ANGRY BIRDS AND ANGRY BIRDS SEASONS
1. Download and install 7zip
2. Click RMB on angry birds seasons *.ipk file and select 7zip > Unpack here
3. It will unpack data.tar archive. Unpack it too
4. After unpacking, you will have this folder: "\usr\palm\applications\com.rovio.angrybirdsseason s"
5. Go to this folder and edit appinfo.json file:
change: "title": "Angry Birds",
to: "title": "Angry Birds Seasons",

6. Download IPK Packager from Attachments
7. Open IPK packager and click on [...] button next to Folder:..........
8. Select this folder "com.rovio.angrybirdsseasons"
9. Click Create IPK File
10. Save it to your desktop, copy to your phone and enjoy playing these games

Proof http://www.youtube.com/watch?v=6RSGsrUlAzM