MS V8 / CE - NLS files for DWG codepage 45 not found error

I received some files from contractor (he's using some older version of Acad) and during opening or attaching as ref file I'm getting this error message >

The NLS files are not found to convert text entities from the DWG codepage 45!

I haven't found any relevant info on the net for codepage 45, could someone please share some light what codepage is it and what language shall I add to my system to clear this message?
there are also lots of warning messages about linestyles may have not complete data, is there a way to fix it?