i use xp but when saved in eps or plt and opened it contains no bytes 0 bytes nothing is saved

I try to save in plt to be able to use a cutter At home with inkscape there is no problem but here it is written 0 bytes when i loook how big the file is.
What do i do wrong ?
CARL-ERIC FROM SWEDEN

Thanks for a wonderful program. My pupils love it. I tried Auto cad before but for my needs this is just 100% There is just one thing, when saved i cant open up in my router program I have a small mill for plexi and aluminum My pupils are just now designing there own lettuce cutlery in plexiglass dr...