File Extension MAILHOST

File extension "mailhost" is associated with MSN Explorer email. It is one of the program's server preferences files. It cannot be opened directly but rather serves to provide information to the program; when an end user changes preferences from within the MSN Explorer email program, those preferences are stored within the mailhost file as well as a file with the extension "DOWNLOADHOST".
 
 
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Mailhost files are named in the format MSNx.mailhost, wherein X represents the version of the MSN Explorer email program. (For instance, MSN7.mailhost refers to version 7 of the program.)

The mailhost preferences file as well as the downloadhost file are both necessary in order for MSN email to function correctly. Should either become damaged or corrupted, the program may not open, or the user may not be able to send and receive email. Common reasons why these files may become damaged include registry errors. Installation of some antivirus or antispyware programs may also corrupt these files.
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More Info Regarding File Extension MAILHOST

If the user has encountered email errors, there are several steps that can be taken that may remedy this problem, regardless of the version of MSN Explorer email that is being run.

This fix may be run on any version of Windows operating systems. This fix should also be run if the mailhost file is no longer present on the user's system.

• From the start menu, select "run"
• Type the following without quotation marks: "regsvr32 c:progra~1msnmsncorefilesmailui.dll"

Be sure to type the space between regsvr32 and the path.

This should fix the mailhost error by restoring the file to its original state. If the program still will not run, there may also be a corrupt or missing downloadhost file, in which case the following fix should restore that file:

• From the start menu, select "run"
• Type the following without quotation marks: "regsvr32 c:progra~1msnmsncorefilesmsnmetal.dll"

Again, note the space between the two sections of typing.

If this does not restore the email program to a working state, there may be a third problem. The program uses a hosts file with the extension "msn", which stores information about blocked websites and internet hosts. The hosts.msn file can become damaged or corrupt when malware programs instate their own restrictions on the computer's internet usage, in an attempt to override the MSN program settings.

To check whether this has happened, open the file in Notepad. It should contain an IP address and domain name for each server that is blocked, as well as some program comments (these are lines prefaced by the pound sign). If "passport.com", "hotmail.com", "mcafee.com", "symantec.com", or "kaspersky.com" are present, the file has been compromised by malware. The additions of these lines were designed to prevent MSN from communicating with these sites.

To remedy this issue, the user should boot into safe mode, perform a full system scan using anti malware software. (The malware that affected the hosts.msn file must first be removed before restoring the file, or it may again add the offending lines to the file upon reboot.) After the malware is removed, one of the following actions should be taken:

• Advanced users that feel comfortable editing the hosts code may delete the above server references and re-save the hosts file. (It may be a good idea to make a copy of the file before performing edits, although the file is not necessary for Windows to run so inaccurate edits will not impact computer operation. However, it does offer a reference point in case it is edited incorrectly by mistake.)

• Users that do not feel comfortable making these changes may try simply deleting the hosts file. Often, MSN Explorer mail will run without the presence of the hosts file. (Bear in mind that without the hosts file, it will not be possible to block domains automatically when checking email.)

If the file has been deleted and the program will not run, the hosts file will need to be restored from the program disk, from the partition backup files, or from the MSN website. If this is not possible, the MSN Explorer email program should be reinstalled. Reinstallation should not interfere with the current email present on the system, but making a backup copy of the folder prior to installation is an advisable precaution. After reinstalling, verify that the program is again in working order and that historic emails are present, then delete the backup folder.

 
 
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