Opening old .tbpd files

Hi, i have a lot of old .tbpd files that i can no longer access. i was wondering if there was a way to open them?
I now only have access to a trial of harmony, as i rarely use it these days, but would love to gain access to the work i had done.
thanks for the help!

You can have Toon Boom convert them if you own a Harmony license.

As part of the license you receive a folder for uploading files to convert.