It appears that you can render models saved in STEP 3D (.stp, .step) formats to Pro/Engineer's .slp files, but for this you will either need the original software, it's successor or some kind of 3rd party conversion programs would be capable of this procedure.
Home > Search converters: step to slp
Conversion of step file format to slp file format beta
Search for step to slp converter or software able to handle these file types.
Convert ISO-10303 STEP product data to Pro/ENGINEER rendering data.
We have found one software suitable in our database for this conversion.
Microsoft Windows software 
- convert step to slp on Windows
PolyTrans|CAD+DCC
A 3D CAD translation software
File extension | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|
Convert from step file | No | No | No | No | No | Yes | No | No |
to slp file | No | No | No | No | No | Yes | Yes | 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: step file extension details, slp file extension details
STEP
Files with step file extension are quite often found as 3D model / part files saved in STEP (Standard for the Exchange of Product Data) format.
SLP
Files with slp file extension can be found as ASCII 3D graphics exported from Pro/Engineer (now known Creo Elements/Pro).
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