Unable to enter GMail - error with file CAS52VMZ

[flossy]

User was able to log in successfully until a few days ago. But since then after entering name/password a File Download window appears stating:
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Some files can harm your computer. If the file information below looks suspicious, or you do not fully trust the source, do not op;en or save this file.

File name: CAS52VMZ
File type:
From: gmail.google.com

Would you like to open the file or save it to your computer?
Open Save Cancel More Info

[checked] Always ask before opening this type of file
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If we try to open it Windows 2000 cannot determine what file type this is since file has no suffix.

If we Cancel, user cannot go further into GMail.

I looked up CAS52VMZ in several search engines but no hits.

We tried logging in at another workstation, same results.

[darrenstraight]

Ok this is really weird, have you tried contacting gmail about it, thats probably the best thing you can do.

http://gmail.google.com/support/?ctx=gmail&hl=en

Gmail contact email:
gmail-support[at]google[dot]com