VS 2010 How To Decompress A Zlib-compressed File

I would like to decompress/compress text files in zlib format.

Here's what I tried:

- Downloaded zlibwipa.dll from [URL] and tried to add a reference to it but got an error saying it is an invalid assembly.

- Downloaded DotZLib from [URL] but can't get it to work, error message: Unable to load DLL 'zlib.DLL': The specified module could not be found. (Exception from HRESULT: 0x8007007E)

- Looked at this [URL] but couldn't do much with it

This files are textfiles created from flash with ActionScript 3.0, but compressed, using the ByteArray class's compress() method. I know Flash uses zlib algorithm for this, and I would like to open and use this file from vb.net.

I am using something like :

FileOpen(1, OpenMapDialog.FileName, OpenMode.Binary, OpenAccess.ReadWrite)
Dim a() As Byte = {}
FileGet(1, a)

[Code]....

How do I decompress a zlib compressed file with byte arrays?