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What does GtaImg do?
It lets you work with GTA SA IMG archives (Version 2).
In short, you can extract and replace files inside the archive.
How?
- 
    
Extract:
Edit > Extract
Select the items you want to extract, then click Extract.
You’ll be prompted to choose a pathname for each selected item. - 
    
Replace:
Edit > Replace
Select the item you want to replace, then click Replace.
You’ll be prompted to choose a file, and each selected item will be replaced with the content of that file. - 
    
Save:
File > Save
This will overwrite the currently opened archive. - 
    
Save As:
File > Save As
This will save the currently opened archive to a new pathname. - 
    
Filter:
To filter the items, type something in the entry field at the bottom, then press Enter.