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Note
Mac users should refer to the Admin Guide for Macintosh.
Some files with the.cfg file extension are also created when you change the settings of a particular program or computer application. For example, if you change the interface settings of a particular application the application will create a new CFG file to accommodate those settings. Mar 16, 2013 This feature is not available right now. Please try again later. Hi, this.cfg file has been a pain in the ass. I am trying to modify my router files so it blocks ads from router. I do not want to use applications like adblock or adblockplus, I want to know how to open.cfg files and read them and edit them. When I open them with textedit, it is all random symbols, and it is non readable.
Administrators typically configure installers before deployment via preferences and properties so that machines under their control share the requisite settings. Both Acrobat and Reader share a common set of preferences and are similar in their configuration details. Since per-machine user interface configuration is not scalable, Adobe provides two key resources to help you configure Acrobat and Reader prior to deployment:
- Customization Wizard: A free utility for configuring the installer prior to deployment. It is offered in both Windows and Mac versions.
- Preference Reference: A dictionary of registry and plist preferences.
Note
Adobe strongly recommends that you do not make changes to the registry unless you are knowledgeable about editing and troubleshooting application settings. Improper use of this feature can result in the corruption of critical system files Before modifying the registry, make sure you understand what product versions are supported, what the default settings are, and how to create new keys.
Fundamentals¶
Before continuing, you should know that:
The tables and examples in most documents use the Windows registry. Naming conventions and paths are relatively similar on Macintosh, Unix, and Linux systems.
The Preference Reference describes 500+ settings.
HKCU settings are end user settings. Most user interface settings have a corresponding HKCU preference.
HKLM preferences will lock a feature and require administrator privileges to modify.
Preference names are case sensitive.
Just because you don’t see the preference doesn’t mean it’s not there and/or cannot be used:
- Some preferences exist internally and are not visually apparent in the registry until after a feature is used. Subdirectories may also appear as the code is exercised.
- Many features are not enabled by default and their related preferences must be manually created.
- Many preferences cannot be set thought the UI and must be manually created.
- The easiest way to configure the product is to exercise the UI and then manually massage the preferences which don’t have a corresponding UI.
Preference locations¶
- Settings for the currently logged-in user:
HKEY_CURRENT_USERSoftwareAdobe(productname)(version)
- Lockable keys (32 bit):
HKEY_LOCAL_MACHINESOFTWAREPoliciesAdobe(productname)(version)FeatureLockDown
- Lockable keys (64 bit):
HKEY_LOCAL_MACHINESOFTWAREWow6432NodeAdobe(productname)(version)FeatureLockdown
- Non lockable machine keys:
HKEY_LOCAL_MACHINESOFTWAREAdobe(productname)(version)
Note

DC products use the track name as the version. Thus, the Continuous track will always use “DC” and the Classic track will always use a year such as 2015 or 2017.
Acrobat DC preferences: Classic track
Data types¶
When adding new keys to the registry it is critical that you get the Value data and Name fields correct as shown below. Most preferences have a data type prefix. These need to be added in the format that the application can recognize.
Prefix | Data Type | Registry type | Description |
---|---|---|---|
a | atom | REG_SZ | The string may be UTF-8 and can therefore include Unicode. The Value Data field is typically entered as text. For example, a value for cHandlers:aPrivKey could be Adobe.PPKLite . |
b | bool | REG_DWORD | 0 (false) or 1 (true). |
c | cab | N/A | Containers that hold keys are preceded by a “c” on Windows. |
i | int | REG_DWORD | An integer. |
s | string | REG_BINARY | ASCII only. |
t | text | REG_SZ | The string may be UTF-8 and can include Unicode. The Value Data field is entered as text. For example, a value for cEDC:tLastServerURL could be https://aps.serv.com:123 . Note: 7.x and earlier use REG_BINARY and tValue. |
a, s, or t | ASPath | See a, s, and t above. | ASPath objects require three components:
|
Administrator locking¶
Many preferences may be locked so that end users cannot change them via the product’s user interface. To do so, set them in the location described above. Some preferences only reside in the lockdown location and do not have a counterpart in the user preference area. For details about specific preferences, refer to the Preference Reference.
Sample use case¶
Modifying existing or creating custom preferences requires some knowledge of the supported naming conventions and data types. In general:
- “Hives” are usually the top-level HKCU, HKLM, and other directories, but it’s also common to refer to subdirectories by the same name.
- Folders/directories that contain the actual preferences (keys), appear in the left-hand window, these often are the home for sub containers.
- Some keys are containers called “cabs” (Windows) or “dictionaries” (Mac). These names are always prepended by a “c” on Windows. For example,
cAdobe_ChainBuilder
andcAcceptablePolicyOIDs
. The lowest level key container is an array. Item names are always “c” + <index number>. Thus, an array undercAcceptablePolicyOIDs
could be c0, c1, c2, c3, and so on. The subkey structure has a dependency on the data type of the parent container. Cabs at the c0, c1, c2, etc. level use a subdirectory namedcValue
that contain the actual key data. For all other data types, store the value directly at the c0, c1, c2, etc. level - The lowest key level defines the actual preference. It is always a name/value pair.
To create a new preference on Windows for example:
- Open the registry editor.
- Look up the preference you want to set in the Preference Reference or the pertinent document. You’ll need to know the path, name, and value.
- Navigate to the required location.
- Create any container keys you might need on the left-hand side of the editor.
- Highlight that containing key and in the right hand side, right click and choose New > <some data value>.
- Enter a name.
- Right click on the preference name and enter a value.
APIs and the SDK¶
Many preferences are exposed in the API. The plugins use the cross platform ASCab preference mechanism supported by all Acrobat products. This mechanism uses calls such as AVAppGetPrefCab
and AVAppSetPrefCab
, that were introduced in Acrobat 5.0. Refer to the Acrobat and PDF Library API Reference for details on these calls.
Using an external drive between Mac and Windows computers can be a hassle, since you constantly have to reformat it to fit which computer you're using it on. Instead of reformatting it all the time, just use the much more platform-independent exFAT and never format it again.
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Windows' default NTFS is read-only on OS X, not read-and-write, and Windows computers can't even read Mac-formatted HFS+ drives. FAT32 works for both OSes, but has a 4GB size limit per file, so it isn't ideal. You can always install drivers for those other OSes, but that doesn't help when you're sharing files with your friends' computers. Besides, it's kind of a hassle. The exFAT file system is a much simpler option.
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exFAT has been around for awhile, but we've never really talked about it. Essentially, it's a file system that's both readable and writable on any modern Mac or Windows machine (sorry, Leopard users). All you need to do is format the drive on a Windows machine and you're good to go. Note that you can't format it on OS X, you have to format it on Windows for it to be compatible with both platforms (Update: A lot of you are noting that OS X formats these just fine, so your mileage may vary). To do so, just:
- Open up Windows Explorer and right-click on your drive in the sidebar. Choose 'Format'.
- In the 'File System' dropdown, choose exFAT instead of NTFS.
- Click Start and close this window when finished.
From then on, that drive should work fantastically between Mac and Windows machines. It won't work with Linux unless you install Linux's exFAT drivers, but for most people, exFAT is just about perfect.
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Guide: How to format an external drive to work seamlessly with Macs and PCs without third party software | MacTip via Reddit