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Supported modifications of the HP Universal Print Driver
The HP UPD must be installed exactly as it was received from HP, with no modifications except as provided by
HP-supplied utilities such as HP DCU, HP DDU, or HP Web Jetadmin. No other driver modifications are
supported.
The HP UPD must be installed using the HP-supplied installer (INSTALL.EXE) or using Microsoft recommended
and HP-approved tools and/or process listed in Installation methods and environments in this chapter. The use of
any other tool or method must be approved by HP in writing to be considered a supported installation method.
Any modifications to any HP UPD driver files (.INF, .MSI , etc.), making registry edits after installation, or manually
copying or deleting files, except when explicitly instructed to do so by HP in writing, will result in an unsupported
configuration.
The HP UPD should be deleted using only Microsoft-supplied tools and procedures. Manual deleting of registry
entries and/or driver files is not recommended and not supported. See Uninstall the HP UPD in this chapter for
more information.
Install HP UPD v5.1 and later
Use this section to install or upgrade HP UPD v5.1 or later.
Determine the HP UPD version installed
To determine if the HP UPD is already installed, open the Printers folders using one of the following methods:
Command Line: From a command prompt (Start→Run, type cmd, and then press Enter) type the following
command to open the Printers folder: control printers
User Interface: This is dependent on the operating system version. For Windows 7, click Start and then click
Devices and Printers.
Right mouse click on the printer (print queue) and then select Printer properties.
For an HP UPD dynamic mode installation, the HP UPD version displays on the lower left.
o To see the unidrv.dll or pscript5.dll versions, select a printer in the dynamic U/I, click OK and select the
About tab. The HP UPD version displays at the top. The unidrv.dll and pscript5.dll versions are listed
under Driver Files.
For an HP UPD traditional mode installation, select the About tab. The HP UPD version displays at the top. The
unidrv.dll and pscript5.dll versions are listed under Driver Files.
Microsoft Windows Driver Architecture
The HP UPD PCL 6 driver is dependent on the Microsoft Windows Unidriver (unidrv.dll) architecture. The HP UPD PS
driver is dependent on the Microsoft pscript5.dll. The HP UPD release notes provide the unidrv.dll and pscript5.dll
version used by HP for internal testing and subsequently qualified by Microsoft’s WHQL test process. The Microsoft
WHQL certification gives the HP UPD the Certified for Windows logotype. The HP UPD is supported by HP for all
versions releases of unidrv.dll and pscript5.dll.that remain under Microsoft’s standard support. It is the expectation
that Microsoft’s updates and changes to unidrv.dll or pscript5.dll will be backward compatible in support of the
Microsoft Windows® universal print driver architecture. Any unexpected behavior resulting from the dependency on
the Microsoft unidrv.dll or pscript5.dll requiring code change to the HP UPD would become a candidate for fix in the
next release of the HP UPD, and/or investigated with Microsoft, as required. The HP UPD installer is one of several
possible distribution mechanisms for the shared unidrv.dll and pscript5.dll files.
The HP UPD includes the unidrv.dll and pscript5.dll. This means that the HP UPD installation package might update
the unidrv.dll and pscript5.dll as necessary during install.
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