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Help and Frequently Asked Questions
Why can't I view images, even though I've installed AVT?
Try the sample images on our
test page. If the test images work well,
then you should investigate whether there is a problem at the server that you're trying to get images from.
Macintosh FAQ
I downloaded Accel ViewTIFF, but I can't find the installer.
If you have not already run the installer then you must run the installer that
was downloaded from our site or sent to you via e-mail.
- Locate the installer program. Its file name is "AccelViewTIFF Installer.pkg".
Depending on whether you got AccelViewTIFF from our web site
or by email, It will be located in your browser's "download" folder, or
your email program's "download" folder.
Your default download folder is determined by a setting in your browser.
Check your browser's setting, or check typical settings for a default download folder including:
- your Desktop
- a folder called "downloads" in your Home folder.
- a folder called "downloads" in your Documents folder.
- If you cannot locate the AccelViewTIFF installer,
use Finder, pick Find from the File menu and search for
"AccelViewTIFF".
- You should find the "AccelViewTIFF Installer.pkg" file.
Double-click it and follow the instructions.
- If you still cannot locate "AccelViewTIFF Installer.pkg",
you may need to download Accel ViewTIFF from the Acordex web site again.
When I run the installer, I get a message saying it's "from an unidentified developer."
This message comes from the Gatekeeper Preference Panel in OS X 10.7.5 and above.
Gatekeeper will, by default, not allow you to run the installer.
- Ensure that you have downloaded "AccelViewTIFF Installer.pkg" from acordex.com.
- Control-click (or right-click) "AccelViewTIFF Installer.pkg",
and on the revealed context menu, choose "Open."
- On the ensuing dialogue box, choose "Open" as well.
Note that this will exempt this file from Gatekeeper, so, if needed, it can be run again by double-clicking.
- If you want to learn more about Gatekeeper, see the
Apple Support page about Gatekeeper.
I'm using Safari and can't get Accel ViewTIFF to work
Safari version 3 (which was released with OS X 10.4.11) and higher does not allow plug-ins
to handle images, so Accel ViewTIFF cannot work with Safari.
Acordex Imaging recommends Firefox or Camino for great features and flexibility,
including Accel ViewTIFF compatability.
For OS X 10.8, Acordex recommends Camino.
[ Download Firefox ]
[ Download Camino ]
I get an error message that says:
"This page asks to use a plugin that can only run in 32-bit mode"
Running Firefox in "32-bit mode" is a requirement for using the Accel View TIFF plugin.
There are two methods for enabling 32-bit operation.
METHOD 1: Set 32-bit mode as Firefox default
- "Right click" on the Firefox application icon in Finder
- Pick the "Get Info" item
- Click the "Open in 32-bit mode" check box as shown on the right.
- Firefox will stay in 32-bit mode, even if your system is rebooted.
METHOD 2: Set 32-bit mode on demand
- Firefox will prompt the user with a message under the toolbar.
- Click the "Restart in 32-bit mode" button. You should now be able to view images.
- Firefox / Accel View TIFF will work correctly for viewing other images without being prompted.
- You will only be prompted again if your system is rebooted.
I cannot see the toolbar, or I cannot see the image.
First we need to make sure that Accel ViewTIFF is installed. If
Accel ViewTIFF is not installed, you may not see any image, or if
you see the image it will have no toolbar at the top of the image.
Determine whether Accel ViewTIFF is installed:
- Quit your browser.
- Double click on the file "AccelViewTIFF Installer.pkg"
If you don't know where this file is, see the FAQ above entitled
"I downloaded Accel ViewTIFF, but I can't find the installer."
- Double Click the Installer. If you do not get a message that the plug-in has installed
try downloading a new copy of the installer.
- Confirm that no earlier version of Accel ViewTIFF is installed.
Within Firefox, look under the "Tools" menu, select "Add-ons".
If you see two versions of AccelViewTIFF, disable the older version (lower version number).
Learn more about managing your plugins
from this Firefox page.
Accel ViewTIFF is enabled, but
I still don't see an image. Instead I see a big white space.
This may be caused by QuickTime being installed. The next
question describes how to disable QuickTime.
Also, confirm that you are running Firefox 3.6 (or later).
Safari prohibits image display plug-ins (see the Safari FAQ).
Accel ViewTIFF is enabled, and I see the image, but I still have no controls, and nothing happens when
I click on the image.
If QuickTime is not disabled, you will see the image but will have no toolbar.
In Firefox 3.6, there is a known bug that makes disableing a
plugin not always work correctly. The following instructions will allow
Firefox to use Accel ViewTIFF
- Quit Firefox.
- In Finder, double click on the icon for your hard drive.
- Select the "Library" folder, and the "Internet Plugins" folder within Library.
- Under the File menu, select "New Folder". Name the folder "Unused Plugins".
- Move the "QuickTime Plugin" file to the Unused Plugins folder.
- Restart Firefox.
In versions of Firefox before 3.6:
- Within Firefox, under the "Tools" menu, select "Add-ons".
- In the Add-ons window, seect the "Plugins" tab.
- If there is a line for "QuickTime Plug-in" select it, and click on the button labled "Disable".
- Quit and relaunch your browser and try again.
In OS X version 10.4 or earlier:
- Select "System Preferences" from the "Apple" menu.
- Select "QuickTime" from the "Internet and Network" section.
- Click the "MIME Settings" button at the bottom of the "Plug-In" tab (10.3 or earlier),
or the Advanced Tab (10.4 Tiger).
- Click the triangle next to the "Images - Still Image Files" category to
expand the list of image types.
- Scroll down to the "TIFF Image File" entry and UNCHECK the check box next to it.
- Click "OK" and close the QuickTime settings window.
- Quit and relaunch your browser and try again.
If none of those work, contact Acordex for more help.
Can I delete the Accel ViewTIFF installer once Accel ViewTIFF is installed correctly?
Yes. You can always download a copy of the installer from the Acordex web site.
To reinstall at a future time, always
keep the license information you received (usually by email) when you purchased AccelViewTIFF.
Less common problems:
When I try to print, I get the error message: Printing Failed, System Error -50
A number of users have reported an Accel VT printing problem on
Macs with the message "Printing Failed, System Error -50". This can be
fixed by deleting the preferences and trying again:
- first view an image, choose "About ViewTIFF" from the plugin menu
- click "Register" and then write down your registration name and code
- quit the web browser
- delete the preferences file "/users/(your username)/library/preferences/Accel ViewTIFF Prefs"
- start the browser and view an image. The plugin will ask for your registration again. Use the previous code you wrote down.
- choose 'Print Setup" from the plugin menu, select your printer and save, then choose print from the same menu
Windows General FAQ
I downloaded Accel ViewTIFF, but I can't find the installer.
If you have not already run the installer then you must run the installer that
was downloaded from our site or sent to you via e-mail.
- Locate the installer program. Its file name is "AccelVT.exe", which is a self-extracting ZIP file.
- If you do not know where the file is located on your system, then from the Start menu, choose Search,
then All Files or Folders. Enter "AccelVT.exe" in the field labelled File Name
and click "Search". Below the window should appear the file you are looking for.
- Double click on the program file to run it.
Can I delete the Accel ViewTIFF installer once Accel ViewTIFF is installed correctly?
You should keep your "AVTInstall.exe". If you get a new browser
version in the future, it is possible to install it without your current plug-ins or Active X Controls.
You will need "AVTInstall.exe" to reinstall Accel ViewTIFF.
Saved images aren't where I put them on my Windows Vista computer. Where did they go?
Internet Explorer in Windows Vista has what is called "Protected
Mode". This means that when you download a file from an un-trusted
site, it is saved in a secure, "virtualized" location. There are three
ways of dealing with this:
- Trust your site: If you are getting all of your images from the
same site (uspto.gov for example), you can add that site to your
"Trusted Sites" in the security tab under the Network Options menu
pick in Internet Explorer. The "Enable Protected Mode" checkbox
should be unchecked for the trusted sites tab.
- Make the problem go away: If you are getting images from multiple
sites, or the above solution doesn't work for whatever reason, you
can turn off protected mode entirely by unchecking the "Enable Protected
Mode" checkbox under "Internet" on the security tab under the
Network Options menu. This should turn off protected mode for all
sites.
- Deal with the problem: If you don't want to, or can't, turn off
protected mode, you can manually copy the image file out of the
virtualized folder and into the real location. If your user name is
MYNAME, and you want to save the file on your desktop
(C:\Users\MYNAME\Desktop), the file would actually be in:
C:\Users\MYNAME\AppData\Local\Microsoft\Windows\Temporary Internet Files\Virtualized\C\Users\MYNAME\Desktop\filename.TIF
Windows Firefox FAQ
I just installed Accel ViewTIFF, but it doesn't seem to be running when I view images.
You may have not completely exited Firefox and started it again after running the installer.
Bookmark this page so you can easily return here, then close all Firefox windows (check the toolbar at the bottom of your screen and
make sure there are no buttons with the Firefox name or icon), then start Firefox, use your
bookmark to return to this page and then try the test TIFF Images again.
I tried to run the Accel ViewTIFF installer, but it may have failed to run correctly.
- The installer should display a location to "unzip" the files to, this is normally "C:\Program Files\Accel ViewTIFF". On Vista
you may not have permission to this folder, so you can change the folder to another location. Click
"UnZip" to decompress the files and store them on your hard drive. You should get a message indicating the files were "Unzipped"
successfully, click "OK".
- The installer will then automatically run the "AVTInstall.exe" file.
- If you have already done the "Unzip" step, you can rerun the installer by using "My Computer", navigating to "C:\Program Files\Accel ViewTIFF".
and double clicking the "AVTInstall.exe" file. Use the Find method described above if you do not know where the "AVTInstall.exe" file
is located.
- Click the Install button. You should very quickly get a message indicating installation was complete.
If you get a message other than this, then installation did not succeed.
- If you get a message that says "Cannot install while the plug-in is in use" then make sure that Firefox
is not running. No buttons with the Firefox name or icon should appear on the button bar at the bottom of your screen.
- If you get another error message, write the error message down just as it appears.
This is very important in diagnosing the problem when contacting Acordex customer support.
- If Accel ViewTIFF for Windows is properly installed, the Tool Bar shown below will be displayed in the bottom left of the frame
that is displaying the TIFF image.

The Accel ViewTIFF installer could not find the copy of Firefox I am running.
- The installer will display a dialog listing the location of the Firefox plugins folders
on your system. If you have more than one copy of Firefox on your system, the location for Firefox will
specify "All copies found" indicating that the installer will install for all copies of Firefox.
- Check the "Install Internet Explorer Active
X Control for viewing TIFF Images" checkbox if you want to install for Internet Explorer as well.
- You can restrict the installation to only one Firefox, but this is not recommended.
To restrict the installation, use the pull-down menu to see the location of all the Firefox plugins folders on your system.
Select the one location rather than "All copies found".
I still can't see the Accel ViewTIFF Tool Bar.
- Sometimes the QuickTime plug-in can interfere with Accel ViewTIFF. Move the files "NPqtplugin.dll", "NPqtplugin2.dll", and
"NPqtplugin3.dll", from the Firefox "Plugins" folder to a different folder.
- If you still can't see images, use "Windows Explorer" to verify that the file "NP~avtif.dll" is in the Plugins folder for Firefox. If not
you can manually copy it from the "C:\\Program Files\\Accel ViewTIFF" to the Plugins folder.
Windows IE FAQ
I just installed Accel ViewTIFF, but it doesn't seem to be running when I view images.
You may have not completely exited Internet Explorer and started it again after running the installer.
Use Add to Favorites from the Favorites menu so you can easily return here, then close all Internet Explorer windows
(check the toolbar at the bottom of your screen and
make sure there are no buttons with the E icon), then start Internet Explorer, use your
Favorites menu to return to this page and then try the test TIFF Images again.
I tried to run the Accel ViewTIFF installer, but it may have failed to run correctly.
- The installer should display a location to "unzip" the files to, this is normally "C:\Program Files\Accel ViewTIFF". On Vista
you may not have permission to this folder, so you can change the folder to another location. Click
"UnZip" to decompress the files and store them on your hard drive. You should get a message indicating the files were "Unzipped"
successfully, click "OK".
- The installer will then automatically run the "AVTInstall.exe" file.
- If you have already done the "Unzip" step, you can rerun the installer by using "My Computer", navigating to "C:\Program Files\Accel ViewTIFF".
and double clicking the "AVTInstall.exe" file. Use the Find method described above if you do not know where the "AVTInstall.exe" file
is located.
- The installer will display a dialog with a check box for installing
the Active X control for Internet Explorer. Make sure the "Install Internet Explorer Active X Control for viewing TIFF images" check box is checked.
If you want to install for Firefox as well and the Firefox installation folder field is blank and you believe that Firefox is installed on your system,
then you must use the Browse button next to the field and browse to the plugins folder for Firefox. If you do not know where this
is located then from the Start menu, choose Search, then All Files or Folders. Enter "plugins" in the field labelled
File Name and click Search. Below the window should appear a list of plugins folders on your system. Look at the file paths shown in the
In Folder column, the one that contains the word "Firefox" or "Mozilla" is the Firefox plugins folder
and you should select this with the installer's Browse button for Firefox.
A likely location for the Firefox "Plugins"
folder is: "C:\\Program Files\\Mozilla Firefox\\Plugins".
- Click the Install button. You should very quickly get a message indicating installation was complete. If you get a message
other than this, then installation did not succeed. If the message says "Cannot install while the Active X control is in use" then make sure that Internet Explorer
is not running (no buttons with the E icon should appear on the button bar at the bottom of your screen). Write the error message down as it is
very important in diagnosing the problem when e-mailing customer support below.
- If Accel ViewTIFF for Windows is properly installed, the Tool Bar shown below will be displayed in the bottom left of the frame
that is displaying the TIFF image.

When I try to view an image, nothing appears where the image should be.
You may not be able to access TIFF images because your Security Level setting
for the Internet Zone is set to High. Internet Explorer will disable
content that requires Active X if the Security Level is set to High for the zone
containing that web page.
To check this, choose Internet Options
from the Tools menu, then select the Security tab. If the security level is set
to High for the zone that the TIFF file is coming from (most
likely the Internet Zone) then you must set it to Medium to view images. You can
also select Custom Level and just enable Run ActiveX controls
leaving the rest of the high security options alone.
Try a sample TIFF Image when you're done with these steps.
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