MATLAB: Error using unzip (line 84)

MATLABunzipzip

I need to unzip files automatically in my matlab and when I use the unzip function, I can't unzip a file ending in .sp3.zip.
I need a solution, being able to use some external command, anything, however, needs to be fast because I will work with a large volume of data.
Attached is an example of the data I'm trying to unzip and can't.

Best Answer

The file is not zip and is not gzip either.
If you happen to be using Mac or Linux, then rename the file to end with .Z and then use the system uncompress utility
!cp igs18143.sp3.zip igs18143.sp3.Z
!uncompress *.Z