The following is a brief description of the contents of a standard System 7.5 Extensions folder. The contents of your Extensions folder may vary. You can use the Extensions Manager control panel to disable any of the following extensions, if you do not need them to be active on your system.
The Extensions Manager control panel
The Extensions Manager control panel lets you control which Extensions load when your computer starts up.
The Extensions
The System 7.5 extensions are listed in alphabetical order:
A/ROSE
Allows communication between the Macintosh main logic board and Macintosh Coprocessor Platform (MCP) based NuBus cards which run the Apple Real-Time Operating System, such as Apple Token Ring 4/16 NB card or the Apple Serial NB card.
About Apple Guide
This is the guide file which provides information about Apple Guide. When in the Finder, you can read the contents of this file by selecting About Apple Guide under the question mark icon in the upper right corner of your screen.
Apple CD-ROM
This is the driver software for any installed Apple CD-ROM drive.
Apple Guide
Apple Guide is Apple's integrated help system.
Apple Photo Access
This is part of the CD-ROM software which lets you view Kodak PhotoCDs.
AppleScriptLib
AppleScriptLib implements the AppleScript Open Scripting Architecture (OSA) component.
AppleScript
AppleScript provides you with the ability to automate repetitive tasks within scriptable applications.
AppleShare
AppleShare is the software that lets you have access to shared network volumes through the Chooser.
AppleTalk ImageWriter
This is the printer driver for a networked ImageWriter printer.
Audio CD Access
This is part of the CD-ROM software that lets you play audio CDs through your internal or external CD-ROM drive. It requires the AppleCD Audio Player or equivalent to control the CD.
Assistant Toolbox
Base extension for Auto Remounter (for PowerBook computers), allows file synchronization, battery management, and easy mobile computing. Provides support for "Persistent RAM disk" and deferred printing. Has a conflict with the Select 310 printer driver, and can block printing. The workaround is to turn off background printing.
Caps Lock
Provides caps lock function for PowerBooks (the keyboards do not have Caps lock key). When the caps lock function is active, an "up" arrow is displayed in the menu bar next to the Balloon Help icon.
Clipping Extension
Lets Drag & Drop create clipping files on the desktop.
Color Picker
Color Picker is a tool that presents a standard interface for color selection. With this dialog, any application can ask the user to choose a color.
EM Extension
This extension detects if you are pressing the space bar while your computer is starting up. If the space bar is pressed when the EM Extension is loaded, the Extensions Manager control panel is immediately launched.
EtherTalk Phase 2
This is the driver software that lets a Macintosh connect to an Ethernet network.
File Sharing Extension
File Sharing lets you share part or all of your hard drive so others on a network can access it.
Find File Extension
The Find File extension instructs the System to use the Find File desk accessory in place of the Find command built into the Finder. If you disable this extension with Extensions Manager, and then choose Find from the File menu, you will get the old Find interface from System 7.1.
Finder Help
Provides the support for Balloon Help for the Finder.
Finder Scripting Extension
Provides support for scripting of the Finder through AppleScript.
Foreign File Access
This is part of the CD-ROM software that lets you mount non-Macintosh file system CDs such as ISO 9660 or High Sierra formats.
High Sierra File Access
This is part of the CD-ROM software that lets you view non-Macintosh file system CDs created in the High Sierra format.
IIci/IIsi Monitors
Hardware specific information for the Monitor Control Panel that describes the capabilities of the built in video card for the IIci and IIsi.
Removing this file has no effect on the ability of the Macintosh to use the built-in video card or the ability to select the bit depth, but options that are found in the "option" section of the Monitor Control Panel may not be available (gamma settings, for example).
ImageWriter
This is the ImageWriter print driver.
ISO 9660 File Access
This is part of the CD-ROM software that lets you view non-Macintosh file system CDs created in the ISO 9660 format.
LaserWriter
This is the LaserWriter print driver version 7.2.
LaserWriter 8
This is the LaserWriter print driver version 8.x.
MacinTalk Pro
Lets a Macintosh computer read text documents in human-like voices.
Macintosh Guide
Apple Guide database describing Macintosh.
MacTCP Token Ring Extension
For customers who have standardized on TCP/IP over Token Ring.
Mailbox Extension
Provides Mailbox support under PowerTalk.
My Speech Macros
Support for Speech Macro Editor.
Network Extension
Used by Personal File Sharing to select network options.
ObjectSupportLib
ObjectSupportLib is a library developers use to implement the OSA object model. For example, how to refer to a word of a paragraph of a document.
Personal LaserWriter SC
This is the Personal LaserWriter SC print driver.
PowerBook Guide Additions
Apple Guide database describing PowerBook related topics.
PowerBook Monitors Extension
Hardware specific information for the Monitor Control Panel that describes the capabilities of the Video system for the PowerBooks.
Removing this file has no effect on the ability of the Macintosh to use the built-in video card or the ability to select the bit depth, but options that are found in the "option" section of the Monitor Control Panel may not be available (gamma settings, for example).
PowerPC Finder Update
Extends the width of the "About This Macintosh" dialog box (under the Apple Menu). This extension prevents the Macintosh Name from being clipped. The names of the Power Macintosh computers are longer than the standard Macintosh names, and part of the name was not displayed in the standard About This Macintosh dialog box.
PowerPC Monitors Extension
Support for AudioVision 14" Monitor.
PowerTalk Extension
Provides support for the PowerTalk services. Also has information that the keychain uses.
PowerTalk Guide
Apple Guide database describing PowerTalk.
PowerTalk Manager
Provides management of the AOCE Mailbox and services.
Printer Descriptions
This folder contains descriptions for a multitude of printers that are used by the LaserWriter 8 driver.
Printer Share
Provides the ability to share non-network printers (like StyleWriter II), across a network.
PrintMonitor
PrintMonitor handles the printing process when you have Background Printing enabled.
Quadra AV Monitors Extension
Hardware specific information for the Monitor Control Panel that describes the capabilities of the built in video card for the Quadra & Centris AV systems.
Removing this file has no effect on the ability of the Macintosh to use the built-in video card or the ability to select the bit depth, but options that are found in the "option" section of the Monitor Control Panel may not be available (gamma settings, for example).
Quadra Monitors Extension
Hardware specific information for the Monitor Control Panel that describes the capabilities of the built in video card for the Quadra & Centris Computers.
Removing this file has no effect on the ability of the Macintosh to use the built-in video card or the ability to select the bit depth, but options that are found in the "option" section of the Monitor Control Panel may not be available (gamma settings, for example).
QuickTime
Lets you play QuickTime movies within any application that supports QuickTime.
QuickTime PowerPlug
Provides native support of QuickTime for Power Macintosh computers when used in combination with QuickTime 2.0. It, by itself, is not a fully functional version of QuickTime. It is an extension which must be used in addition to QuickTime 2.0.
QuickTime Musical Instruments
Supports 30 Roland Standard MIDI sound samples that can be accessed by QuickTime applications with no additional MIDI equipment.
Scripting Additions
These extend the AppleScript language with special features, such as finding the date or time of day. With scripting additions installed, AppleScript acts as if these features are part of the language. Scripting additions are required only when a script uses them; many scripts use them.
SCSI Manager 4.3
This is an update to the driver software used by the Macintosh to access hard drives. It is coded into the ROM in the Power Macintosh computers.
Shortcuts
Apple Guide database describing Finder Shortcuts.
Speech Guide Additions
Mix-In for Apple Guide describing speech.
Speech Recognition
Provides support for Speech recognition.
SR Monitor
Extension used to monitor and interpret speech.
StyleWriter II
This is the print driver for the StyleWriter II.
System Speech Rules
Supports the voices/dialect of speech.
TokenTalk Phase 2
Driver for Token Ring Card.
TokenTalk Prep
Support for TokenTalk Phase II.
Video Guide Additions
Mix-In for Apple Guide describing Video.
WorldScript Power Adapter
Support for Language Kits on Power Macintosh computers.
Extensions Added by System 7.5 Update 1.0
Apple Guide
Apple Guide version 1.2.5 improves performance, runs native on Power Macintosh models, and is compatible with At Ease.
File Sharing
File Sharing version 7.6.1 improves overall performance and provides new functionality. When file sharing is turned on, removable disks and CD-ROMs will automatically be shared-except for audio CDs, which will no longer be shared. You no longer have to turn off file sharing in order to eject a removable disk or CD-ROM.
Finder Update
Updates resources in the Finder code.
MathLib
The updated Math Functions Library (MathLib) boosts performance of math operations on Power Macintoshes.
SCSI Manager
Adds SCSI Manager version 4.3.1
Speech Manager
Speech Manager version 1.3 is included. It was not included on the System 7.5 upgrade disks.
ThreadsLib
ThreadManager resource.
Update File Replaces Some Extensions
The System 7.5 Update file loose in the System Folder contains the functionality of and removes the following extensions: EM Sound Update, PowerBook 150 Update, and Mount IDE Drive.
Extensions Added by System 7.5.2
7200 & 9500 Guide Additions
Mix-In for Apple Guide describing the Power Macintosh 7200 & 9500.
7500 & 8500 Guide Additions
Mix-In for Apple Guide describing the Power Macintosh 7500 & 8500.
Apple Color SW Pro CMM
ColorSync 2.0 color-matching method file for maintaining consistent color information between documents.
AV Setup
Extension used by Sound & Displays control panel included in the second release of System 7.5.2.
Color SW 2000 Series CMM
ColorSync 2.0 color-matching method file for maintaining consistent color information between documents.
Color SW 2400
This is the print driver for the Color StyleWriter 2400.
Color SW Pro
This is the print driver for the Color StyleWriter Pro.
ColorSync
Resources for color matching between different hardware and applications.
Display Guide Additions
Mix-In for Apple Guide describing Sound and Displays control panel on the Power Macintosh 7500 and 8500.
Energy Saver Extension
Provides compatibility for background prcesses associated with Energy Saver software.
Energy Saver Guide Additions
Mix-In for Apple Guide describing Energy Saver software on the Power Macintosh 7500 and 8500.
Ethernet (Built-In)
Open Transport code resource to allow access to built-in Ethernet port.
Graphics Accelerator
Provides video acceleration for the PCI video card on the Power Macintosh 9500.
Macintalk 3
Speech generation extension included in the second release of System 7.5.2.
Open Tpt AppleTalk Library
Open Transport code resource for AppleTalk communication protocol.
Open Tpt Internet Library
Open Transport code resource for TCP/IP communication protocol.
Open Transport Library
Open Transport code resource.
OpenTptAppleTalkLib
Open Transport code resource for AppleTalk communication protocol.
OpenTptInternetLib
Open Transport code resource for TCP/IP communication protocol.
OpenTransportLib
Open Transport code resource.
Printer Descriptions Folder
Contains PostScript drivers for Apple printers.
Scripting Additions Folder
Contains AppleScript applets used in various preinstalled scripted functions such as MonitorDepth switching in the Control Strip.
Serial (Built-In)
Open Transport code resource to allow access to built-in serial port.
SystemAV
Audio-video input extension included in the second release of System 7.5.2.
Tutorial Items
Files used when running the Macintosh Tutorial under the Apple Guide menu.
Video Startup
Extension used by Apple Video Player.
Voices Folder
Contains voice files used by PlainTalk and Text-to-Speech applications.