The execlution method of FNDCPPUR executable file is Spawned which means the execution file is a C or Pro*C program.
Not sure if afppur can be decompiled,but looks like it is not avaiable.
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You may refer this (Doc ID 822368.1) hope this helps to address your queries.
Refer..for more details...
Concurrent Processing - How To Run the Purge Concurrent Request FNDCPPUR, Which Tables Are Purged, And Known Issues Like Files Are Not Deleted From File System (Doc ID 822368.1)
Refer to Note 822368.1 - 'Purge Concurrent Request FNDCPPUR Does Not Delete Files From File System or Slow performance'.
Concurrent Processing - Best Practices for Performance for Concurrent Managers in E-Business Suite (Doc ID 1057802.1)