Puzzle. Txt file with encoded text. How to decode?

I have a text file, that contains 50,000 lines of "strange" text:

UEsDBBQAAgAIACaOVEA6e5H83pcBAMLBAQArAAAAW1NhbXN1
bmddIC0gVGVzdCB0YXNrIC0gU291bmQgZGVjcnlwdG9yLnBu
Z+z9ZVBcXdcFiia4B/cgTQPBJTgEC9bBEtwCBCe4uwVtNN24
QyAQ3C24OwR3d3e303zv++T57vl5761zbt06VV3V1bLWXjLX
mGOuNcfe4I8K0phopGgvXrzABMlIKL14AY/x4gUCKQoc7Jsv
3GZA2NtLByVp8RfFQ+Q7sA8IpmLyYi9elEWh339BhH2mMpRR
kn/xwp3uxQvfgBcvbmFf+W6/eOHE/uLFrv6LFwIJL14Q2ab8
/iT04sVTJEhCTMVVdz8VMUW18+6JF1Rfv2fh4uISpoGCAsUN
pWIMRfz169f0L99Rmdw3aDKaMWgoxCFFGT8qD5+8rkZuBp86
FupLdS4PvYcs9GwP5/nfDjfkCm8l1m0ZEeHjG+1gv8T5+0LB
FgX+n77owcX59yO2H/tLMLAK7d9vQqioINkm1HAAqv++cEFf
4f9+AHwnfekGVVrL1vj71Ua4r4QSf4EtgTqChOj/vKi4YYXy
7JSY/17EXkoUkJeiWhvK9L/qAWeP8zHEoYT4/s9LlJ+GCqIy
xKjTSfBPU2QiYDV/TcGX/afijBSc7zKMpgTFq6G+/y2XDauZ
gVshlPafij8OocgAYyvQ1O0kRf9bTglWcwwpfSfuPxW/MUUA
Qvs0Awtq//YiD1bzh4hoA/A/Fce8hXVio7BNVedvL8ZhNf/s
ApVJ/FNxHwmsE/ZqK4zFf3vxFVbz/+fD8yTi1xn2lPDWdMXj
aJBUyKivv6TB6wn+wcb89pRA3VHgoTL3cu4IsuDiw8dbIql2
OAhu3teuKD/s6/tNbwcd215q3qfT1GRBa7+hgaNMJkjDnoY2
98VqH9VtwdOnXV9j8jaMXzY1vfNoFHTaNZWNu/90uycGyDuf
gjDj/7dJuDSlnjd9/BVEjSM2u2OKkdaT6xN7xTue

And at this moment, I don't know how to process this text. Effectively it reads like puzzle text.

What is it?

Solution

This is a Base64 encoding of a PNG file called Sound decryptor.png.

Use any Base64 decoder to convert it to a file... Such as this one: http://download.cnet.com/Base64-Encoder-Decoder/3000-10250_4-10555647.html