Hi to all!
Well, I've tested some file compressors to use with my pendrive.
So, ther's one that works ok! It's called 7Zip (www.7-zip.org) and it's freeware.
Well, the instalation is a bit tricky but it's worth the time.
First, Install the program in your computer. Then find in thr programs file directory the 7-Zip directory. Copy the directory on your pendrive and when you want to compress or descompress, click on the 7zFM.exe.
Use & enjoy!
This program is about 2,24MB.