Win98 with Win98 share file

I have an accesspoint that link up my both windows 98se
computer to be access to internet. My internet work on
both PC but the only things that i can't work with is the
file sharing problem. Both PC i have the same workgroup
and file sharing enable. Both pc have the same network
ID. I able to browse for the network neighborhood and saw
both my PC name there, but when i want to open whatsoever
file on the share PC it cannot! Open the share folder no
problem, just when open file like *.doc, *.exe, *.pdf, etc
all cannot! ONLY SHARE FOLDER IS ALLOW. My both PC have
the USB wireless adapter with infrastructure mode to
connect to my accesspoint. If i change the mode to adhoc
which connect to my other PC point to point it work
successfully. Only in infrastructure mode having problem
in file sharing. Is anyone know the solution?