FileForums - UPX eXecutable Compressor

I noticed that not alot of people are using upx to compress their programs and i used it on my own compressor
The compressor was about 181 megabytes because i included every compressor i put my hands on it then i used UPX it gave :
181.354.135==>80.971.440 that's good in some cases
i always work on worst case
So i made this script that can pack and unpack executables but sometimes doesn't work on some executables it gives these errors and it's because of the exe itself :
(UnknownExecutableFormatException) ......
(NotCompressibleException) ........
(AlreadyPackedException: already packed by UPX) it's already compressed
Anyway i don't know if this was posted before or not
if you want to ask anything about it reply
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