This file exists only during a host run. It contains the future util.dat files' contents, just like mess.tmp contains messages that will be in the RSTs.

Like util.dat, this file is structured in records. In PHost 3.4 and above, the format is as follows:

 +0     WORD    Player Id (whose UTILx.DAT file will contain this data)
 +2     WORD    Record Type (like in UTILx.DAT)
 +4     WORD    Record Length
 +6   n BYTEs   Data
This is a testing version.
It may be incomplete, and have more bugs (or features) than the public live version at planetscentral.com.