Hi, I've tried to get Hat compiling on Windows today, and have had some success. I found the following problems and fixes: 1) hat-trans cannot be compiled with ghc -cpp (it breaks on the string gaps), and cpphs can't be used as pgmP as it is. I have submitted a patch for cpphs to make this possible. With this change, hat-trans builds fine for Windows. 2) When running hat-trans, its remarkably painful on Windows, and I got frequent unexplained crashes, but there are a few patches required: Windows does not have ntohl, so I added a specific one for Windows. SIGQUIT does not exist on Windows, I just commented out this line. fopen(file,"w") should be fopen(file,"wb") to use Binary mode under Windows. With these patches, the remaining issues are build issues - I am intending to write a very hacky hat-make which sorts these out, possibly in a Windows specific way, to make it a single hat-make Main command to generate a hat binary. I did not build the hat translated libraries under Windows, I took the Linux versions. With these changes I am able to generate a simple hat file that can be processed by the Linux hat tools properly. Thanks Neil