It looks like that sch to dsn conversion represents attempt to transform older CAD schematics (.sch) to newer OrCAD files (.dsn), something that seems to be pretty complicated but not impossible. Your best option would be to consult Cadence support / forums, but you certainly will need OrCAD installed.
Home > Search converters: sch to dsn
Conversion of sch file format to dsn file format beta
Search for sch to dsn converter or software able to handle these file types.
Convert CAD schematics to OrCAD schematic capture data.
We have found one software suitable in our database for this conversion.
Microsoft Windows software 
- convert sch to dsn on Windows
OrCAD PCB Designer
A modeling suite used to design printed circuit boards
File extension | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|
Convert from sch file | No | Yes | No | No | No | No | No | No |
to dsn file | No | Yes | Yes | dsn editor | Yes | No | No | No |
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.
Additional links: Open sch file, Open dsn file
SCH
Files with sch extension are generally 3D schematics created and saved in one of the CAD programs.
DSN
Files with dsn extension can be found as PCB schematics prepared and saved by the OrCAD, a PCB designing suite.
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