R help - Oct 2011 - Serialization help.

I have the following code:

c <- file("c:/temp/r/SkuSalesModel.br", "rb")
s <- unserialize(c)
close(c)
rm(c)

And it worked as late as yesterday. Today when I came in I get the 
following error:

Error in .Call("R_unserialize", connection, refhook, PACKAGE =
"base") :
   negative length vectors are not allowed

I have not upgraded or changed any installation and the file has not 
changed. Any ideas on how I can get more info or solve this error?

Thank you.

Kevin

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