Unknown compression method.

[FengPu]

These are two files with the same suffix that I extracted from the reverse UE4 game pak file. But one of them should have used some kind of compression method.

I know I should use the umodel tool to extract it, but umodel does not support saving files for this game.

I hope to receive help, thank you!

 

This is a file without compression, I have provided it in the attachment.
I can clearly see the file tag ,version,data...

 

This is a file that has been compressed in some way.
I can see some data with the same tags and versions as the uncompressed file.
The file header contains fixed bytes such as 0x8C06.
I'm not sure about the specific compression method, I've never encountered it before.
I have also provided it in the attachment.

 

file.zip

 

[Thief1987]

8C 06 is one of the common oodle's magic numbers, try to use it. The problem with oodle is that you need to know decompressed size for decoder to work afaik, so if you don't know it, it might be an issue.

Edited July 7 by Thief1987

[FengPu]

On 7/7/2025 at 8:17 PM, Thief1987 said:

8C 06 is one of the common oodle's magic numbers, try to use it. The problem with oodle is that you need to know decompressed size for decoder to work afaik, so if you don't know it, it might be an issue.

Thank you, the information I got from Google also points to oodle