how to extract big files?

[tomekthemessenger]

I have such problem.
I have in big file png images which are probably compressed. FileMaster cannot open this archive due to some error.
However all other tools like Big File Extractor or finalBig can open and extract this archive but they don't support decompress operation.
So after png files are extracted I cannot open them with the aid of photoshop or convert to tga format. I suppose those extracted files needs to be decomporessed if finalBig/Big File Extractor didn't do by default.
Can anybody help?

 

[EfekanP]

There is no GUI but you can try https://github.com/withmorten/big4f

 

[tomekthemessenger]

I checked source code and this tool also doesn't decompress files. I think only File Master can do but it doesn't open my .big file.