{"id":17712,"date":"2020-08-01T11:11:18","date_gmt":"2020-08-01T05:41:18","guid":{"rendered":"http:\/\/198.58.113.91\/blog\/?p=17712"},"modified":"2026-03-10T13:26:31","modified_gmt":"2026-03-10T07:56:31","slug":"api-ms-win-crt-heap-l1-1-0-dll-runtime-is-missing-error","status":"publish","type":"post","link":"https:\/\/www.winhelponline.com\/blog\/api-ms-win-crt-heap-l1-1-0-dll-runtime-is-missing-error\/","title":{"rendered":"Fix: Api-ms-win-crt-heap-l1-1-0.dll or api-ms-win-crt-runtime-l1-1-0.dll is missing"},"content":{"rendered":"<p>When you run a program on a computer running Windows 8.1 or earlier, you may see an error denoting that the module <strong>api-ms-win-crt-heap-l1-1-0.dll<\/strong> or <strong>api-ms-win-crt-runtime-l1-1-0.dll <\/strong>is missing. Here&#8217;s the full error message verbatim:<\/p>\n<div class=\"err\">The program can&#8217;t start because api-ms-win-crt-heap-l1-1-0.dll is missing from your computer. Try reinstalling the program to fix this problem.<\/div>\n<div class=\"err\">The program can&#8217;t start because api-ms-win-crt-runtime-l1-1-0.dll is missing from your computer. Try reinstalling the program to fix this problem.<\/div>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-17714\" src=\"https:\/\/www.winhelponline.com\/blog\/wp-content\/uploads\/2020\/08\/api-ms-win-crt-runtime-dll-missing.png\" alt=\"api-ms-win-crt-heap-l1-1-0.dll missing\" width=\"497\" height=\"193\" \/><\/p>\n<p>For example, these errors may occur when playing online games or while running programs that were compiled using Microsoft Visual Studio 2015 &amp; Windows 10 SDK &#8212; e.g., Office Word, Excel, Access, Skype, QGIS, Apple iTunes, or Adobe products.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-17713\" src=\"https:\/\/www.winhelponline.com\/blog\/wp-content\/uploads\/2020\/08\/api-ms-win-crt-runtime-dll-missing-2.jpg\" alt=\"api-ms-win-crt-heap-l1-1-0.dll missing\" width=\"573\" height=\"259\" \/><\/p>\n<p>These DLL missing errors usually indicate that the VC++ runtime libraries are missing. A runtime library is a collection of files (usually .dll files) used by some programs at run-time to provide one or more native program functions or services.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-6338 alignleft\" src=\"https:\/\/www.winhelponline.com\/blog\/wp-content\/uploads\/2018\/07\/icotip.gif\" alt=\"tips bulb icon\" width=\"34\" height=\"34\" \/>Uninstalling and reinstalling the respective program <strong>can help<\/strong> in cases where the software vendor has packaged the runtime library within the installer.<\/p>\n<p>Many users have attempted to download and install the <a href=\"https:\/\/www.microsoft.com\/en-us\/download\/details.aspx?id=48145&amp;751be11f-ede8-5a0c-058c-2ee190a24fa6=True\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">Visual C++ Redistributable for Visual Studio 2015<\/a>. However, this may not resolve the issue. This article tells you how to fix the above errors easily using an update released by Microsoft.<!--more--><\/p>\n<div class=\"rp\"><strong>RELATED:<\/strong> <a href=\"https:\/\/www.winhelponline.com\/blog\/fix-api-ms-win-core-libraryloader-l1-1-1-dll-missing-error-windows-10-upgrade\/\">Fix: Api-ms-win-core-libraryloader-l1-1-1.dll Missing Error During Windows 10 Upgrade<\/a><\/div>\n<h2>Resolution<\/h2>\n<p>The api-ms-win-crt-heap-l1-1-0.dll or api-ms-win-crt-runtime-l1-1-0.dll missing errors mostly occur on Windows 8.1 and earlier systems. Microsoft Visual Studio 2015 creates a dependency on the Universal CRT when applications are built by using the Windows 10 Software Development Kit (SDK).<\/p>\n<p>To resolve the problem, you&#8217;ll need to install the Universal C Runtime (CRT) update on earlier Windows operating systems to enable these applications to run correctly.<\/p>\n<p><em>The Windows 10 Universal CRT is a Windows operating system component that enables CRT functionality on the Windows operating system. This update allows Windows desktop applications that depend on the Windows 10 Universal CRT release to run on earlier Windows operating systems.<\/em><\/p>\n<ul>\n<li>Download <a href=\"https:\/\/support.microsoft.com\/en-gb\/help\/2999226\/update-for-universal-c-runtime-in-windows\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">Update for Universal C Runtime in Windows<\/a> (for Windows 8.1\/8\/7\/Vista)<\/li>\n<\/ul>\n<p>Here&#8217;s the list of modules added or updated by the Universal C Runtime update:<\/p>\n<pre>Api-ms-win-crt-conio-l1-1-0.dll\r\nApi-ms-win-crt-convert-l1-1-0.dll\r\nApi-ms-win-crt-environment-l1-1-0.dll\r\nApi-ms-win-crt-filesystem-l1-1-0.dll\r\nApi-ms-win-crt-heap-l1-1-0.dll\r\nApi-ms-win-crt-locale-l1-1-0.dll\r\nApi-ms-win-crt-math-l1-1-0.dll\r\nApi-ms-win-crt-multibyte-l1-1-0.dll\r\nApi-ms-win-crt-private-l1-1-0.dll\r\nApi-ms-win-crt-process-l1-1-0.dll\r\nApi-ms-win-crt-runtime-l1-1-0.dll\r\nApi-ms-win-crt-stdio-l1-1-0.dll\r\nApi-ms-win-crt-string-l1-1-0.dll\r\nApi-ms-win-crt-time-l1-1-0.dll\r\nApi-ms-win-crt-utility-l1-1-0.dll\r\nUcrtbase.dll<\/pre>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-3101 alignleft\" src=\"https:\/\/www.winhelponline.com\/blog\/wp-content\/uploads\/2016\/05\/hand.png\" alt=\"handpointer\" width=\"49\" height=\"27\" \/>For more information, expand the <strong>File information<\/strong> section in the above Microsoft article to view the list of file names included in the package for each Operating System.<\/p>\n<div class=\"rp\"><strong>RELATED:<\/strong> <a href=\"https:\/\/www.winhelponline.com\/blog\/fix-vcruntime140-dll-missing-error-windows\/\">Fix: VCRUNTIME140.DLL is missing from your Computer<\/a><\/div>\n<h3>Additional Note<\/h3>\n<p>Windows 10 includes the <code>api-ms-win-crt-heap-l1-1-0.dll<\/code> file by default. Here&#8217;s the module information from a Windows 10 v2004 computer:<\/p>\n<pre>c:\\windows\\syswow64\\downlevel\\api-ms-win-crt-runtime-l1-1-0.dll:\r\nVerified: Signed\r\nSigning date: 6:13 AM 12\/7\/2019\r\nPublisher: Microsoft Windows\r\nCompany: Microsoft Corporation\r\nDescription: ApiSet Stub DLL\r\nProduct: Microsoft\u00ab Windows\u00ab Operating System\r\nProd version: 10.0.19041.1\r\nFile version: 10.0.19041.1 (WinBuild.160101.0800)\r\nMachineType: 32-bit\r\n\r\nc:\\windows\\system32\\downlevel\\api-ms-win-crt-runtime-l1-1-0.dll:\r\nVerified: Signed\r\nSigning date: 6:27 AM 12\/7\/2019\r\nPublisher: Microsoft Windows\r\nCompany: Microsoft Corporation\r\nDescription: ApiSet Stub DLL\r\nProduct: Microsoft\u00ab Windows\u00ab Operating System\r\nProd version: 10.0.19041.1\r\nFile version: 10.0.19041.1 (WinBuild.160101.0800)\r\nMachineType: 64-bit<\/pre>\n<div class=\"rp\"><strong>RELATED:<\/strong> <a href=\"https:\/\/www.winhelponline.com\/blog\/download-missing-system-files-dll-exe-sys-from-microsoft-site\/\">How to Download Missing System files (dll, exe, sys) from Microsoft site<\/a><\/div>\n<p>Hope that helps!<\/p>\n<p><em>(Last reviewed on 24-June-2022)<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>When you run a program on a computer running Windows 8.1 or earlier, you may see an error denoting that the module api-ms-win-crt-heap-l1-1-0.dll or api-ms-win-crt-runtime-l1-1-0.dll is missing. Here&#8217;s the full error message verbatim: The program can&#8217;t start because api-ms-win-crt-heap-l1-1-0.dll is missing from your computer. Try reinstalling the program to fix this problem. The program can&#8217;t &#8230; <a title=\"Fix: Api-ms-win-crt-heap-l1-1-0.dll or api-ms-win-crt-runtime-l1-1-0.dll is missing\" class=\"read-more\" href=\"https:\/\/www.winhelponline.com\/blog\/api-ms-win-crt-heap-l1-1-0-dll-runtime-is-missing-error\/\" aria-label=\"Read more about Fix: Api-ms-win-crt-heap-l1-1-0.dll or api-ms-win-crt-runtime-l1-1-0.dll is missing\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[7],"tags":[191,988],"class_list":["post-17712","post","type-post","status-publish","format-standard","hentry","category-windows","tag-error-messages","tag-runtimes"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":6061,"url":"https:\/\/www.winhelponline.com\/blog\/fix-api-ms-win-core-libraryloader-l1-1-1-dll-missing-error-windows-10-upgrade\/","url_meta":{"origin":17712,"position":0},"title":"Fix: Api-ms-win-core-libraryloader-l1-1-1.dll Missing Error During Windows 10 Upgrade","author":"Ramesh","date":"December 26, 2017","format":false,"excerpt":"When you try to upgrade to Windows 10 from a Windows 7 computer using the Windows 10 Update Assistant tool, the following error may pop up: Windows10UpgraderApp.exe - System Error The program can't start because api-ms-win-core-libraryloader-l1-1-1.dll is missing from your computer. Try reinstalling the program to fix this problem. Precisely,\u2026","rel":"","context":"In &quot;Windows 10&quot;","block_context":{"text":"Windows 10","link":"https:\/\/www.winhelponline.com\/blog\/category\/microsoft\/windows\/windows-10\/"},"img":{"alt_text":"api-ms-win-core-libraryloader-l1-1-1.dll error windows 10 upgrade","src":"https:\/\/i0.wp.com\/www.winhelponline.com\/blog\/wp-content\/uploads\/2017\/12\/w10-api-ms-win-core-missing.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":80375,"url":"https:\/\/www.winhelponline.com\/blog\/api-ms-win-core-winrt-l1-1-0-dll-is-missing\/","url_meta":{"origin":17712,"position":1},"title":"[Fix] api-ms-win-core-winrt-l1-1-0.dll is missing (Adobe Acrobat Reader)","author":"Ramesh","date":"March 2, 2026","format":false,"excerpt":"Since the Feb 2026 update of Adobe Acrobat Reader, Windows 7 users receive the following error when opening a PDF or the Adobe Acrobat Reader app. You wonder how to get the missing api-ms-win-core-winrt-l1-1-0.dll file. AcroRd32.exe - System Error The program can't start because api-ms-win-core-winrt-l1-1-0.dll is missing from your computer.\u2026","rel":"","context":"In &quot;Windows 7&quot;","block_context":{"text":"Windows 7","link":"https:\/\/www.winhelponline.com\/blog\/category\/microsoft\/windows\/windows-7\/"},"img":{"alt_text":"adobe reader update scheduled task - stop and disable","src":"https:\/\/i0.wp.com\/www.winhelponline.com\/blog\/wp-content\/uploads\/2026\/03\/disable_adobe_update_task.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.winhelponline.com\/blog\/wp-content\/uploads\/2026\/03\/disable_adobe_update_task.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.winhelponline.com\/blog\/wp-content\/uploads\/2026\/03\/disable_adobe_update_task.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.winhelponline.com\/blog\/wp-content\/uploads\/2026\/03\/disable_adobe_update_task.png?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":23883,"url":"https:\/\/www.winhelponline.com\/blog\/vc-redist-visual-studio-2015-2019-listing\/","url_meta":{"origin":17712,"position":2},"title":"VC++ Redist for Visual Studio 2015 &#8211; 2019 (List of Files)","author":"Ramesh","date":"April 29, 2021","format":false,"excerpt":"The latest supported Visual C++ downloads are available for download from Microsoft. In this post, you can see the list of runtime libraries (.dll files) present in the latest Visual C++ redistributable package (for Visual Studio 2015, 2017, and 2019.) Here are some of the examples of the missing runtime\u2026","rel":"","context":"In &quot;Microsoft&quot;","block_context":{"text":"Microsoft","link":"https:\/\/www.winhelponline.com\/blog\/category\/microsoft\/"},"img":{"alt_text":"hand point icon","src":"https:\/\/i0.wp.com\/www.winhelponline.com\/blog\/wp-content\/uploads\/2018\/08\/hand.png?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":6078,"url":"https:\/\/www.winhelponline.com\/blog\/fix-vcruntime140-dll-missing-error-windows\/","url_meta":{"origin":17712,"position":3},"title":"[Fix] Missing VCRUNTIME140.DLL, VCRUNTIME140_1.DLL, MSVCP140.DLL","author":"Ramesh","date":"January 1, 2018","format":false,"excerpt":"On your Windows 10 or 11 computer, a 3rd party program (e.g., Epic Games) may throw the error that the module VCRUNTIME140.DLL, VCRUNTIME140_1.DLL, or MSVCP140.dll is missing from the computer. Here are the error messages which you may encounter: The program can't start because VCRUNTIME140.dll is missing from your computer.\u2026","rel":"","context":"In &quot;Windows&quot;","block_context":{"text":"Windows","link":"https:\/\/www.winhelponline.com\/blog\/category\/microsoft\/windows\/"},"img":{"alt_text":"powertoys runtime files","src":"https:\/\/i0.wp.com\/www.winhelponline.com\/blog\/wp-content\/uploads\/2018\/01\/runtimes-powertoys.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.winhelponline.com\/blog\/wp-content\/uploads\/2018\/01\/runtimes-powertoys.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.winhelponline.com\/blog\/wp-content\/uploads\/2018\/01\/runtimes-powertoys.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.winhelponline.com\/blog\/wp-content\/uploads\/2018\/01\/runtimes-powertoys.png?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":74737,"url":"https:\/\/www.winhelponline.com\/blog\/missing-mfc110u-dll-vc-runtime\/","url_meta":{"origin":17712,"position":4},"title":"Fix for &#8220;Mfc110u.dll was not found&#8221; Error","author":"Ramesh","date":"April 9, 2024","format":false,"excerpt":"When you run a program, an error may occur indicating that the file \"mfc110u.dll\" is missing from the computer. The entire error message is below: The code execution cannot proceed because mfc110u.dll was not found. Reinstalling the program may fix the problem. Running DISM and SFC doesn't resolve the issue.\u2026","rel":"","context":"In &quot;Windows&quot;","block_context":{"text":"Windows","link":"https:\/\/www.winhelponline.com\/blog\/category\/microsoft\/windows\/"},"img":{"alt_text":"mfc110u.dll missing - vc++ redist","src":"https:\/\/i0.wp.com\/www.winhelponline.com\/blog\/wp-content\/uploads\/2024\/04\/mfc110u-dll-missing.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":18026,"url":"https:\/\/www.winhelponline.com\/blog\/youtube-dl-error-msvcr100-dll-runtime-missing\/","url_meta":{"origin":17712,"position":5},"title":"[Fix] Youtube-dl Error MSVCR100.dll not found in Windows","author":"Ramesh","date":"August 23, 2020","format":false,"excerpt":"Youtube-dl is a command-line program to download videos from YouTube or other sites. When you run the software on some computers, you may receive the following error: youtube-dl.exe - System Error The code execution cannot proceed because MSVCR100.dll was not found. Reinstalling the program may fix this problem. Let's see\u2026","rel":"","context":"In &quot;Utilities&quot;","block_context":{"text":"Utilities","link":"https:\/\/www.winhelponline.com\/blog\/category\/utilities\/"},"img":{"alt_text":"youtube-dl error msvcr100.dll 32-bit syswow64","src":"https:\/\/i0.wp.com\/www.winhelponline.com\/blog\/wp-content\/uploads\/2020\/08\/youtube-dl-error-msvcr100-dll.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.winhelponline.com\/blog\/wp-content\/uploads\/2020\/08\/youtube-dl-error-msvcr100-dll.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.winhelponline.com\/blog\/wp-content\/uploads\/2020\/08\/youtube-dl-error-msvcr100-dll.png?resize=525%2C300&ssl=1 1.5x"},"classes":[]}],"_links":{"self":[{"href":"https:\/\/www.winhelponline.com\/blog\/wp-json\/wp\/v2\/posts\/17712","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=17712"}],"version-history":[{"count":0,"href":"https:\/\/www.winhelponline.com\/blog\/wp-json\/wp\/v2\/posts\/17712\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.winhelponline.com\/blog\/wp-json\/wp\/v2\/media?parent=17712"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.winhelponline.com\/blog\/wp-json\/wp\/v2\/categories?post=17712"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.winhelponline.com\/blog\/wp-json\/wp\/v2\/tags?post=17712"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}