"File not found"

[imosha]

i get this error whan i tray 2 open a file from the Desktop

right mouse button -- > Open with --> my project.exe = "File not found"(microsft)

but when i drag and drap the same file into my Project.exe
it's working fine

i can get what he doing what file he didn't found ?
the file type dont make any defrant the only thin that make a defrant that i c
is if i delete all the code in my project not only the main form

What can i do ? (this error is in XP System not in win 98)
how can i find out what file he didn't found?
im losing it Help me please