How to open with Quartus 9.0 a .bdf file created with Quartus 10.0

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it seems that the format of the block design files (.bdf) was changed in quartus 10.0.

When opening with quartus 9 a .bdf file created in quartus 10.0, a "unsupported version number 1.4" error results.

The file can be opened with quartus 9 doing the following changes:

. Open the .bdf file with a text editor.

. Look for the header line:

(header "graphic" (version "1.4"))

. Change the version from 1.4 to 1.3

. Save the file.

But i suspect that with this method some information may be lost.

Is there better way to convert the files?

Julio

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thankyou!!:d