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Windows 7: Bug? Windows Live Mail adds underscores to attachment names

04 Nov 2010   #1

Windows 7 Home Premium 32bit
Bug? Windows Live Mail adds underscores to attachment names

I found out that if a file has an extra dot before the extension, e.g. book1..xls (or book1. if you have "hide known file extensions" enabled in Folder Options), then the following will occur. If you right click the file, click Send to, click Mail Recipient, a new mail window opens up with the attachment of the file RENAMED TO book1._xls. I.e. the extra dot is replaced with an underscore.

Also, the funny thing is if there are additional dots before the extension, only the 2nd, 4th, 6th, etc. dots will be replaced with underscores.

That means if the dot JUST BEFORE the extension is in an even-number position (counting from left to right), it will be replaced with "_", making the file extension looking like "_xls" and thus the attachment will be unopenable by your recipient unless he or she manually deletes the undercore from the extension.


book1...xls will become book1._.xls; file name changed but still openable.

But book1....xls will become book1._._xls; file becomes unopenable.

This does not happen in Outlook Express. It seems to only happen with Windows Live Mail. Anyone can easily recreate this phenomenon. So am I the first one who discovered this? This has to be a bug, right?

My System SpecsSystem Spec

29 Sep 2011   #2

Windows 7 Home Premium x64


I have the same problem. Any solution?
My System SpecsSystem Spec
29 Sep 2011   #3

Windows 8 Pro w/MC 32-bit

Quote   Quote: Originally Posted by doug555 View Post
...Any solution?
From the bug description, it sounds like the solution is to uncheck the folder option to hide known extensions. The extension is useful to know as it tells you what program is likely to open the file and the absense of an extension tells you you that you will be asked what program to use. It also warns you if a file is an executable and possibly malware.
My System SpecsSystem Spec


 Bug? Windows Live Mail adds underscores to attachment names

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