You will need to have a version 10.0.x copy of the software that matches the version the UDB file was created with. The development environment used to create that is the normal place you will work from when maintaining such files.

UltraLite database and software do not provide (nor require) backward compatability due to the development and upgrade models. Normally you will only develope and deploy with the exact same version.

Unfortunately you are past the support life of 10.0.x (as well as 11.0.x for that matter) and so there is no developer edition download available you might have been able to use for that.

I would go back to the source of the database for such software.

SQL Anywhere version 10 is no longer an actively supported version and as a result you will not be able to find a evaluation or developer edition to open this file directly. You could get an developer edition (links found here for v17 and v16) but would need to rebuild the database as described here using the ulunload utility in the v11 directory. Note that you will not be able to use that new database in SQL Anywhere 10.