It is possible but the files need to be in a text format, and there is some work that should be done in a good text editor to get rid of the 7.1 stuff that 7.0 doesn't recognize.
Depending on the project size it could take few minutes, hours or days for the work to be done.
I remember that there was a utility called TD-converter that could do it for some versions of TD, but I think the last version was for TD6.x
I have a question:
If your code is running on TD5.2 you can easily convert it to TD7.0 with migration wizard, but why do you ask for TD7.1 code to TD7.0?
We were in a similar situation some time ago, having versions of our software in TD2.1, 3.x, 5.x, 6.x and 7.x, before we managed to get all of our customers to the 7.x version.
The system we were using was that all of the changes go to the oldest version and than we merge the changes to the latest version, migrating first the code to the desired version.
You must use a versioning system for this to work, we were using SVN (TortoiseSVN as the client) for the task and still do.
So it was a matter of minutes to have all the versions updated, most of the time spent in manual checking in the merge tool that everything was included right and not to override the .DATA sections with the old version...
In this way we could even have different versions of our source (using the latest TD version enhancements)...
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