Windows cannot open SDF files?
When Windows cannot determine which application to use to open this file format type, the cause could be:
We strongly recommend that you run a Instant Scan for related errors.
Files with the SDF extension identify a source definition file used with a Microsoft SQL server. The SDF files store the system information structure and source code data used with the applications. SDF files can be opened and edited with the appropriate software tools.The SDL files are utilized by the Microsoft SQL Server's Relational Engine where it supports the systems organization and searching features. SDL files store data that is used in compact databases designed to run on mobile devices.
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"Not too much to say, just I couldn't open a file, and now I can. Cool."