Partially Downloaded Files Extensions - What are partiallydownloaded files and how do I open a partiallydownloaded file?

What are partiallydownloaded files and how do I open a partiallydownloaded file?

File Type Category File Format
.!bt Partially Downloaded Files BitTorrent Incomplete Download File
.!ut Partially Downloaded Files uTorrent Incomplete Download
.acl Partially Downloaded Files AutoCorrect List File
.acs Partially Downloaded Files Agent Character File
.alt Partially Downloaded Files Dynamics AX Temporary File
.aol Partially Downloaded Files America Online File
.apf Partially Downloaded Files Adobe Profile File
.bbl Partially Downloaded Files BibTeX Generated Bibliography File
.bc Partially Downloaded Files BitComet Partially Downloaded File
.bdr Partially Downloaded Files Publisher Borders File
.ctf Partially Downloaded Files AVG Update Control File
.dal Partially Downloaded Files Download Accelerator Plus URL List
.dct Partially Downloaded Files Dictionary File
.desktop Partially Downloaded Files Desktop Entry File
.dtf Partially Downloaded Files Domino Temporary File
.dwc Partially Downloaded Files Emulex DWC Firmware Update File
.err Partially Downloaded Files AutoCAD Error Log File
.hyp Partially Downloaded Files Dictionary Information File
.mag Partially Downloaded Files Access Diagram Shortcut File
.mar Partially Downloaded Files Mozilla Archive
.mbb Partially Downloaded Files Kodak EasyShare Data File
.msu Partially Downloaded Files Windows Vista Update Package
.mzz Partially Downloaded Files Microsoft .NET Download Package
.nwp Partially Downloaded Files Magnetic Wallpaper File
.odf Partially Downloaded Files OpenDocument Formula
.p10 Partially Downloaded Files Certificate Request File
.ppk Partially Downloaded Files PuTTY Private Key File
.rat Partially Downloaded Files PICS Rating File
.sbc Partially Downloaded Files Office Accounting Company Shortcut File
.slf Partially Downloaded Files Symantec License File
.sls Partially Downloaded Files Image Playlist
.xlw Partially Downloaded Files Excel Workspace File