It appears that .jnb and .spw files are used by SigmaPlot graphing software, so some sort of conversion or data transfer is likely. Considering the support for SigmaPlot's format is pretty limited in 3rd party programs, you will have to use the original tool only.
Home > Search converters: jnb to spw
Conversion of jnb file format to spw file format beta
Search for jnb to spw converter or software able to handle these file types.
Convert SigmaPlot workbook to SigmaPlot worksheet file.
We have found one software suitable in our database for this conversion.
Microsoft Windows software 
- convert jnb to spw on Windows
SigmaPlot
A graphing software
File extension | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|
Convert from jnb file | No | Yes | Yes | jnb editor | Yes | No | No | No |
to spw file | No | Yes | Yes | spw 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: jnb file extension details, spw file extension details
JNB
Files with jnb file extension may be found as spreadsheet workbook created in the SigmaPlot software.
SPW
The spw file extension is related to the SigmaPlot worksheet file format developed by Systat Software Inc.
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