The MIME Type application/x-msdownload is part of the "application" category and it is commonly used to indicate the encoding for the DLL file type when such a file is present within a message. This MIME Type in general describes executable and/or system files that are associated with the Windows and OS2 platforms and is also used for the EXE file type. Due to their executable nature, these file types are often put under block or restricted lists to avoid contracting an infection from these files. Most email services will block these files from being sent over their networks.
application x-msdownload how to open
The Microsoft web site has free viewers for most Office file types. If you can't find a utility to open an attachment with a specific file type on your favorite shareware/download site try OpenWith.org.
Despite what the labelling in this panel might suggest (it says "Thunderbird can automatically save or open attachments of certain types"), these settings simply allow you to change the save/open actions that will be performed when you double-click on an attachment of a specified file type. Changing these settings will not allow save/open actions to be performed automatically for attachments in incoming messages without user intervention. For instance, if you previously used the "Do this automatically for files like this from now on" checkbox to have Thunderbird always open ".doc" attachments with Word, you can undo that file-handling association by clicking on the "DOC" file type and clicking the "Remove Action" button.
To add a download action to this list, open an e-mail that has an attachment of the type you want to add, or write a new e-mail and attach a file of the type that you want to add. Open the attachment and choose how you want Thunderbird to open it. Check the box "Do this automatically for files like this from now on".
The MIME Edit extension adds a Tools -> MIME Edit -> Edit menu command that does everything (except for searching) that the download actions window does, plus it lets you create a entry. It can be very useful if you get a bad setting due to opening an attachment that has the wrong MIME type definition, acknowledged "do this from now on for all attachments of that type" and it replaced the good entry with a bad entry.
To check the content type of an attachment, select the e-mail in a folder but do not open the e-mail. From the menu bar choose View -> Message Source. Find the Content-Type header that names the attachment. Note that there might be many Content-Type headers in the message, so you must be careful to find the one that applies to the attachment you are investigating. A Content-Type header looks like:
Thunderbird uses the content type to decide what to do with the file. If the content type is unhelpful, then Thunderbird uses the file name extension to decide what to do with the file. If the content type does not match the file name extension, then Thunderbird might not handle the file in the way you expect. You might have to save the file so that you can open it in the way you want.
Some mail programs send attachments with a nonspecific content type: application/octet-stream or application/x-msdownload. These content types can apply to various different types of file. Therefore the box "Do this automatically for files like this from now on" is disabled.
If that doesn't help, send yourself an e-mail to which you manually attached a file with this file name extension. (Do not forward an email whose attachment caused the box to be disabled.) Then open the attachment and choose how you want Thunderbird to open it. Check the box "Do this automatically for files like this from now on".
Note: Another workaround is to set your operating system to handle these nonspecific content types using some application. This is not usually a good idea, because these nonspecific content types can apply to various different types of file.
The Content-Type: header for the attachment specifies what type file it is. For example Content-Type: image/jpeg means its a jpeg image file. You may run into an attachment where it is set to application/octet-stream, which will probably cause problems because that means its generic 8bit binary data not associated with any application.
It is supposed to be set to that if the MIME type (content type) is not recognized. This could occur as a side effect of the sender downloading the file using a browser that didn't properly recognize the MIME type. If that happened and they sent it as an attachment the senders email client would not automatically detect and fix the problem. If you run into this problem replacing the mimetypes.rdf file will not help as the problem is with the message you got. You could edit the Content-Type header using an add-on such as Header Tools Lite. However, it might be simplest to configure Thunderbird to open any application/octet-stream attachment with a view utility that relies upon the file extension to decide what type of file it is.
There is no support for configuring Thunderbird to open a .ics file by double clicking on it. It also doesn't generate an error message. This is a known bug. Try holding down the control key while dragging the attachment to the events pane. [1]
If you do not use a Mac, and you receive attachments from a Mac user, then you might see extra attachments that you cannot open. You can ignore these extra attachments, because they contain data that is only useful on a Mac.
If a Mac user sends a file without a file extension as an attachment, Apple Mail doesn't use its knowledge of the file to create a Content-Type for it, it just sends Content-Type: application/octet-stream. As described above, when Thunderbird receives attachments without a file extension or a content-type, it doesn't know what to do with the attachment and has to prompt you.
Thunderbird normally calls the appropriate viewer based on the MIME type in the Content-Type header, regardless of the attachments file extension. The Download Actions table displays the MIME type as a file type. A MIME type of application/pdf is displayed as PDF document for example. The OpenAttachmentByExtension extension provides an alternative approach. Its meant for users who frequently receive messages whose attachments either have the wrong MIME type, or no MIME type. The extension ignores the MIME type and selects the viewer based on the file extension (including no file extension). It also provides the option to specify additional command line arguments when launching the viewer.
Microsoft Office and some related applications produce documents in the generic OLE 2 Compound Document and Office Open XML (OOXML) formats. The older OLE 2 format was introduced in Microsoft Office version 97 and was the default format until Office version 2007 and the new XML-based OOXML format. The OfficeParser and OOXMLParser classes use Apache POI libraries to support text and metadata extraction from both OLE2 and OOXML documents.
When I click Open or Save I get "blahblah.xls couldn;t be downloaded" with a retry and cancel buttons. I click on retry, it opens Excel and displays "The file you are trying to open, 'blahblah.xls', is in different format than specified by the file extension. Verify that the file is not corrupted and .... Do you want to open the file now?"
* application/octet-stream is a generic MIME type which web servers can use to identify any type of binary data and therefore could lead to false positives. It does not apply only to .bin file extensions in the real world.
A file end with .exe extension is really a executable program that when opened causes the operating system to run the program. If you receive an .exe file as an email attachment be sure that the .exe is coming from authenticated source before running it because if you might thinking about what is exe file extension is and then just double click it to see what it is, it will spread a virus in your whole computer RECENT EXAMPLE :- WannaCry
The issue is windows 10 will not open files correctly. I have to constantly re-download a application, if I want to use it. This includes any .exe files, some programs from startup in task manager fail. I get random errors of "This parameter is incorrect", or other random errors for programs. Often times running the program as admin will open some, not all files. I think this is a issue with my registry, as I have found some temporary fixes which help. For example, I put this as a .reg file:
Windows Registry Editor Version 5.00[HKEY_CLASSES_ROOT\.exe]@="exefile""Content Type"="application/x-msdownload"[HKEY_CLASSES_ROOT\.exe\PersistentHandler]@="098f2470-bae0-11cd-b579-08002b30bfeb"[HKEY_CLASSES_ROOT\exefile]@="Application""EditFlags"=hex:38,07,00,00"FriendlyTypeName"=hex(2):40,00,25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,\ 00,6f,00,6f,00,74,00,25,00,5c,00,53,00,79,00,73,00,74,00,65,00,6d,00,33,00,\ 32,00,5c,00,73,00,68,00,65,00,6c,00,6c,00,33,00,32,00,2e,00,64,00,6c,00,6c,\ 00,2c,00,2d,00,31,00,30,00,31,00,35,00,36,00,00,00[HKEY_CLASSES_ROOT\exefile\DefaultIcon]@="%1"[HKEY_CLASSES_ROOT\exefile\shell\open]"EditFlags"=hex:00,00,00,00[HKEY_CLASSES_ROOT\exefile\shell\open\command]@="\"%1\" %*""IsolatedCommand"="\"%1\" %*"[HKEY_CLASSES_ROOT\exefile\shell\runas]"HasLUAShield"=""[HKEY_CLASSES_ROOT\exefile\shell\runas\command]@="\"%1\" %*""IsolatedCommand"="\"%1\" %*"[HKEY_CLASSES_ROOT\exefile\shell\runasuser]@="@shell32.dll,-50944""Extended"="""SuppressionPolicyEx"="F211AA05-D4DF-4370-A2A0-9F19C09756A7"[HKEY_CLASSES_ROOT\exefile\shell\runasuser\command]"DelegateExecute"="ea72d00e-4960-42fa-ba92-7792a7944c1d"[-HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.exe]
And for a moment I can open some files without problem. But this is short lived, I have to keep running this. I have tried reinstalling windows 10, completely wiping my SSD and reinstalling. Which will temporarily help, but the issue always returns. Please help me fix this issue! I'm not sure if its a infection or something else. 2ff7e9595c
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