newer mind, i've got it to work, the application after install is modifying 2 files:
config.sys - adds FILES=55 section
autoexec.bat - adds SET CLIPPER=F45;E0 section
When i run application the SET CLIPPER=F45;E0 section wasn't in dosbox-0.73.conf in [autoexec], but only on autoexec.bat in file on hard disk.
I just added this section to dosbox-0.73.conf and now everything is working, application just wrong displays that maximum opened files is set to 20 because didn't saw SET CLIPPER=F45;E0.
btw i'm wonderin if there is possible to "stretch" in fullscreen, because there are 2 black borders on top and bottom of my app (in fulscreen mode). I've tried all combinaton of output= machine= scaler= and so on and all i get is this 2 bars - 1 on top, 1 on bottom or just 1 doubled bar on top or bottom.
Thank you all for your support and author(s) for great app (dosbox).
Thanks again.