Files that contain the .dctmp file format are most commonly associated with the Direct Connect file-sharing application. When this software program begins to download a file from the Internet, the file is saved with the .dctmp file extension until the file has completed the download process.
Once the file download has completed, the proper file extension is assigned to the file name. For example, if you were downloading an AVI file using the Direct Connect application, the file would be saved as filename.dctmp while the download was in progress. Once the download had been completed the file would be renamed to filename.avi.
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If you have additional information about the DCTMP file format or software that uses files with the DCTMP suffix, please do get in touch - we would love hearing from you.