1. It ignores the search path in the dproj file and hence doesn't find 'something.inc'
2. It doesn't report this as an error
The .dproj files are not supported yet by the converter. It was originally made for the old Delphi 7 type projects where .dproj did not exist.
Yes, they should be supported.
The converter also does not understand dotted unit names used by recent Delphi versions. There are many things that should be improved.
On the other hand recent Delphi and Lazarus and their libraries / components have diverged so much that an automatic conversion may not be realistic. It is still realistic to convert some old Delphi 7 apps fully automatically though.
3. It stuffs up the positioning of the "FileClose(comh); { *Converted from CloseHandle* }" change.
The converter should handle that better even if the .inc file is not found. Somebody should debug what happens there.