Can't open Dia file in Dia 0.83

[Fung Wai keung]

Hi,

    I've downloaded and installed Dia 0.83 in RedHat 5.2.  However, my
Dia can't open any sample dia files, even the files that are saved by
itself.  The error message I have is "not a dia file".  I can only open
dia files given in the samples directory of the Dia source.  I gunzip
the UML-demo.dia and ER-demo.dia and I can open them in dia 0.83.  If I
then save them as other files, I can't open the newly saved files.

    how to solve the problem?

Thanks in advance.

Regards,
Wai-keung, Fung
Dept. of MAE, CUHK