I have found the solution!!!
Are your values in the per app settings or in the general settings. If they are in the per app settings, Use reduce texture quality and quallcom plugin in the general settings and then open gangstar.
Sent from my GT-I5800 using XDA App
OK first of all you should know that the format of tga file given by gameloft is dependent on the device downloading the game.
If someone downloads the files and then reuploads for others then the files being downloaded by others is not compatible with it.
So what you need to do is simple convert those TGA files to open system ie such that these can be run on any system/mobile.
Visit this link actually its in unknown language i too dont know but links are provided with it. :victory:
Visit progamix.heck.in/cara-mod-gangstar-wch.xhtml
from that page download "The Compressonator" link is -> adf,ly/bBoQ5 Password for file is "progamixmod"
download and extract its amd software to view tga files know you need to open tga files being supplied by gameloft in this software and save as new tga files thats it.... Now transfer those to phone and enjoy........
Note: IF software says cant open tga files then rename *.tga to *.dds and retry to open .dds files and save as new tga files.