It is likely that EndNote can export CIW - Web of Science export files directly to PDF format.
Convert EndNote Web of Science export to Adobe Portable document format.
We have found 2 software records in our database eligible for .ciw to .pdf file format conversion.
Microsoft Windows software - convert ciw to pdf on Windows
Search tool for online bibliographic databases
Convert from ciw file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned ciw to pdf. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Apple macOS / Mac OS X software - convert ciw to pdf on OS X
Application to organize bibliographies