ict/exclude_compression is a SAP Parameter attribute which is used to control File extensions which are excluded from HTTP compression. information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
Resources that correspond to the configured file endings are excluded
from HTTP compression, for example, because you are dealing with file
formats that are already compressed. That is, no compression is executed
using HTTP content encoding for these file types.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.