Spooler SHD files are Microsoft Windows shadow spooler files of the file extension .shd. Shadow spooler files are system files that relate to a print job on a printer. .Shd files are only part of the printing process, which is not complete without the automatic pairing of SHD files with SPL files.
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Spooler SHD Files as System Files
Spooler SHD files are system files, meaning that they are used directly by the Windows operating system. Windows creates .shd files when a user decides to print something, thus submitting a print job. Another attribute of system files that applies to spooler SHD files is that they are unique to Windows and are not usable by other operating systems.
Function of Spooler SHD Files
.Shd files spool print jobs, meaning that they store print job header information without storing actual document data. These files are called shadow spoolers because they shadow print job settings and other spooler information, thus allowing a resubmission of the print job if it is interrupted. Spooler SHD files pair up with spooled print data as part of the printing process.
Spooler SHD Files and Spooled SPL Files
Windows spoolers generate .shd files for print job settings along with .spl files, another type of system file, for the actual spooled print data. These files are written to the "C:\Windows\System32\spool\PRINTERS\" directory. ".Shd" stands for "shadow" and ".spl" stands for "spool", the two key components of this process.
Function of Spooled SPL Files
Spooler SHD files shadow SPL files, which contain the spooled digital document data actually sent to the printer. This file type saves the data, temporarily stores it, and empties when the print job is complete. .Spl files are viewable with the EMF Printer Spool File Viewer. These files are not to be confused with FutureSplash Animation video files.
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