The .fxp file extension is most commonly associated with the Adobe Flash Catalyst software application. The FXP files contain project files that have been created by the Catalyst program. Catalyst is used to create a variety of Internet applications. The FXP files contain objects of the Catalyst project including the source code and assets for the app.
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If you have additional information about the FXP file format or software that uses files with the FXP suffix, please do get in touch - we would love hearing from you.