Xnviw portable and ghostscript portable

hello everyone
I have used for a long time xnview ( instralled ) and to use it with the pdf files also install ghostscript.
I never had no problem

but now I'm using the portable version of xnview ( portable apps) and also in this case to use the program with the pdf files I use ghostscript portable

xnview portable and portable ghostscript are installed in the same folder:
D:/ Portable prog/grafic/xnview portable
D:/Portable progr/grafic/commonfiles/ghostscript

but I can not use xnview portable with pdf files
when I try it says that ghostscript is not installed on your(my)system

on xnview pages of portableapps says: ''Automatic support for Ghostscript Portable'' but in my case it does not work; you help me to understand and solve

thanks and sorry for my english

win7 32bit home premium
xnview portable 2.32 (portable apps)
ghostscript portable 9.16 ( portable apps )