Open .mo3 file failed

[LPChip]

[Joke mode on]
Maybe its in MO1 or MO2? xD
[joke mode off]

[mo3file]

The game is Air Strike 2 3D. The company does not exist anymore but there are some archives. Now i know what you are looking for so here is the bass.dll file. Version is 2.1.0.3

[Saga Musix]

Okay, the problem is far easier than that.
Given the path in your screenshots, I suppose you wrote a python script to extract the MO3 files from the game's data file. However, you didn't open the input and/or output file in binary mode, which typically means that on a Windows systems, the characters \r and \n are automatically converted into a Windows line ending (\r\n). As a result, the file you extracted differs from the original data file. To avoid this conversion, binary files must always be opened in binary mode, not text mode!
If you follow this advice, you can extract the music correctly.

[mo3file]

Thanks but i didn't understand what you mean with binary mode, so i extracted the files in Ubuntu Virtualbox instead and it worked perfectly!

[Saga Musix]

Binary mode is a flag for opening files. How to invoke it depends on the programming language you use, so you would have to read up the Python manual on the command that is used for opening files.