{"id":800,"date":"2008-12-23T11:11:36","date_gmt":"2008-12-23T05:41:36","guid":{"rendered":"http:\/\/198.58.113.91\/blog\/?p=800"},"modified":"2021-05-31T14:00:51","modified_gmt":"2021-05-31T08:30:51","slug":"fix-cannot-view-chm-files-network-xp-2003-vista","status":"publish","type":"post","link":"https:\/\/www.winhelponline.com\/blog\/fix-cannot-view-chm-files-network-xp-2003-vista\/","title":{"rendered":"Fix: Cannot View CHM Files from a Network Drive in Windows Vista"},"content":{"rendered":"

When you open a .CHM file over a network drive in a Windows XP\/2003\/Vista computer, the right pane may show the following message instead of displaying the topic\/contents.<\/p>\n

Navigation to the webpage was canceled<\/div>\n

This is perfectly normal, as Microsoft Security Updates 896358 & 840315 block display of CHM file contents when opened from a network drive. And in Windows Vista, the security update is included by default. Microsoft issues workarounds (registry edits) for this problem in article KB896054. It documents the following methods to enable CHM functionality from a network drive.<\/p>\n

    \n
  1. How to use UrlAllowList to enable specific URLs<\/li>\n
  2. How to use the MaxAllowedZone value to enable a security zone<\/li>\n
  3. How to use both UrlAllowList and the MaxAllowedZone value<\/li>\n
  4. Use NestedProtocolList to enable nested protocols within a URL<\/li>\n<\/ol>\n

    Related Tip:<\/b> For downloaded CHM files which are stored in the local hard drive<\/u>, right-click the CHM file, and then click Properties<\/b>. Click Unblock<\/b>. Double-click the CHM file to view the contents.<\/p>\n

    HHReg Utility Automates the Task<\/h2>\n

    HHReg (HTML Help Registration Utility) automates the steps in KB896054. It allows you to register your individual .CHM files or the folders containing your .CHM files, so that it does not compromise security. HHReg works fine in Windows Vista as well.<\/p>\n

    Start HHReg and add the CHM file by clicking Add File<\/b>. To add a network folder that contains CHM files, use the Add Folder<\/b> button, Browse and add the UNC path.<\/p>\n

    You should now be able to view CHM contents from the network share.<\/p>\n

    The setting will be stored in the following registry keys, in a String value named UrlAllowList<\/b>:<\/p>\n

    HKEY_LOCAL_MACHINE SOFTWARE Microsoft HTMLHelp 1.x ItssRestrictions<\/div>\n

    and<\/p>\n

    HKEY_LOCAL_MACHINE SOFTWARE Microsoft HTMLHelp 1.x HHRestrictions<\/div>\n

    Additional Information<\/h3>\n

    If you want to configure the MaxAllowedZone value to enable a security zone as per Example 2<\/i> in KB896054, use the General Security<\/b> tab in HHReg.<\/p>\n","protected":false},"excerpt":{"rendered":"

    When you open a .CHM file over a network drive in a Windows XP\/2003\/Vista computer, the right pane may show the following message instead of displaying the topic\/contents.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[11],"tags":[441],"class_list":["post-800","post","type-post","status-publish","format-standard","hentry","category-windows-vista","tag-registry"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":979,"url":"https:\/\/www.winhelponline.com\/blog\/file-asso-fixes-for-windows-7\/","url_meta":{"origin":800,"position":0},"title":"File Association Fixes for Windows 7 and Windows Vista","author":"Ramesh","date":"December 20, 2009","format":false,"excerpt":"This page contains the file association fixes for some of the common file types. These fixes are applicable for Windows\u00ae 7 and Windows\u00ae Vista systems only. File association fixes for Windows 7 AVI IMG SCR BAT INF TIF\/TIFF BMP JPE\/JPEG\/JPG TXT CHM JS VBS CMD LNK WMA COM MP3 WMV\u2026","rel":"","context":"In "Windows 7"","block_context":{"text":"Windows 7","link":"https:\/\/www.winhelponline.com\/blog\/category\/microsoft\/windows\/windows-7\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1401,"url":"https:\/\/www.winhelponline.com\/blog\/file-association-fixes-windows-10\/","url_meta":{"origin":800,"position":1},"title":"File Association Fixes for Windows 10 (Defaults)","author":"Ramesh","date":"December 30, 2015","format":false,"excerpt":"Here is the list of file association fixes (Windows defaults) for some of the common file types. These registry fixes are applicable for Windows\u00ae 10 only. AVI IMG TXT BAT INF URL BMP JPE\/JPEG\/JPG VBS CHM JS WMA CMD LNK WMV COM MP3 XML EXE PNG ZIP GIF REG Directory\u2026","rel":"","context":"In "Windows 10"","block_context":{"text":"Windows 10","link":"https:\/\/www.winhelponline.com\/blog\/category\/microsoft\/windows\/windows-10\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":4579,"url":"https:\/\/www.winhelponline.com\/blog\/microsoft-security-essentials-adware-pua-protection\/","url_meta":{"origin":800,"position":2},"title":"How to Enable Adware or PUA Protection in Microsoft Security Essentials","author":"Ramesh","date":"November 14, 2016","format":false,"excerpt":"You can enable PUA or adware protection in Windows Defender using different methods explained in the article How to Enable PUA, PUP or Adware Protection in Windows Defender. But, if you\u2019re still using Windows 7 and relying on Microsoft Security Essentials (MSE) for real-time antivirus protection, this post has the\u2026","rel":"","context":"In "Windows 7"","block_context":{"text":"Windows 7","link":"https:\/\/www.winhelponline.com\/blog\/category\/microsoft\/windows\/windows-7\/"},"img":{"alt_text":"enable pua protection in microsoft security essentials","src":"https:\/\/i0.wp.com\/www.winhelponline.com\/blog\/wp-content\/uploads\/2016\/11\/mse-pua-4.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.winhelponline.com\/blog\/wp-content\/uploads\/2016\/11\/mse-pua-4.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.winhelponline.com\/blog\/wp-content\/uploads\/2016\/11\/mse-pua-4.png?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":6431,"url":"https:\/\/www.winhelponline.com\/blog\/eml-file-preview-pane-explorer-windows\/","url_meta":{"origin":800,"position":3},"title":"How to Enable Preview of .eml (Email Message) Files in Explorer","author":"Ramesh","date":"August 6, 2018","format":false,"excerpt":"Many users of Windows Mail or Windows Live Mail (part of Windows Live Essentials) used to backup individual emails and save them as .EML files. Since Windows Live Mail has been discontinued,\u00a0users are forced to use third-party mailers or even buy Microsoft's own produce, Microsoft Outlook. However, the preview pane\u2026","rel":"","context":"In "Utilities"","block_context":{"text":"Utilities","link":"https:\/\/www.winhelponline.com\/blog\/category\/utilities\/"},"img":{"alt_text":".eml file no preview available","src":"https:\/\/i0.wp.com\/www.winhelponline.com\/blog\/wp-content\/uploads\/2018\/08\/eml-preview-0.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.winhelponline.com\/blog\/wp-content\/uploads\/2018\/08\/eml-preview-0.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.winhelponline.com\/blog\/wp-content\/uploads\/2018\/08\/eml-preview-0.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.winhelponline.com\/blog\/wp-content\/uploads\/2018\/08\/eml-preview-0.png?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":182,"url":"https:\/\/www.winhelponline.com\/blog\/fix-thumbnail-preview-for-pictures-w7-vista\/","url_meta":{"origin":800,"position":4},"title":"Fix: Thumbnails Not Showing up in File Explorer","author":"Ramesh","date":"April 14, 2008","format":false,"excerpt":"Are your image files showing up with a generic mountain and lake scene instead of the miniature or thumbnail display in File Explorer? And video files may show up with a generic icon\/thumbnail. This article tells you how to enable thumbnails in File Explorer on Windows 10\/11 and earlier. RELATED:\u2026","rel":"","context":"In "Windows"","block_context":{"text":"Windows","link":"https:\/\/www.winhelponline.com\/blog\/category\/microsoft\/windows\/"},"img":{"alt_text":"thumbnails blank -- fix the IconServiceLib registry setting","src":"https:\/\/i0.wp.com\/www.winhelponline.com\/blog\/wp-content\/uploads\/2008\/04\/iconservicelib-registry-thumbnail-fix.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.winhelponline.com\/blog\/wp-content\/uploads\/2008\/04\/iconservicelib-registry-thumbnail-fix.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.winhelponline.com\/blog\/wp-content\/uploads\/2008\/04\/iconservicelib-registry-thumbnail-fix.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.winhelponline.com\/blog\/wp-content\/uploads\/2008\/04\/iconservicelib-registry-thumbnail-fix.png?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":1082,"url":"https:\/\/www.winhelponline.com\/blog\/misc-registry-fixes-for-windows-10-7-8-xp-vista\/","url_meta":{"origin":800,"position":5},"title":"Miscellaneous Registry Fixes for Windows (All versions)","author":"Ramesh","date":"September 15, 2009","format":false,"excerpt":"Here is a compilation of some useful registry fixes for Windows 7\/8\/Vista\/XP. I might add more fixes as more issues come in. If you have a specific request, please be sure to add it in the Comments section. # Description REG Fix OS 1 Error 1719 Windows Installer Service Could\u2026","rel":"","context":"In "Windows"","block_context":{"text":"Windows","link":"https:\/\/www.winhelponline.com\/blog\/category\/microsoft\/windows\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"_links":{"self":[{"href":"https:\/\/www.winhelponline.com\/blog\/wp-json\/wp\/v2\/posts\/800","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.winhelponline.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.winhelponline.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.winhelponline.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.winhelponline.com\/blog\/wp-json\/wp\/v2\/comments?post=800"}],"version-history":[{"count":0,"href":"https:\/\/www.winhelponline.com\/blog\/wp-json\/wp\/v2\/posts\/800\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.winhelponline.com\/blog\/wp-json\/wp\/v2\/media?parent=800"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.winhelponline.com\/blog\/wp-json\/wp\/v2\/categories?post=800"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.winhelponline.com\/blog\/wp-json\/wp\/v2\/tags?post=800"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}