Just found this on the Microsoft Vista Help & Support forums:
If it has dlm after ISO, it doesn't sound like you received that file from
Microsoft directly. I would urge caution before using it. As far as the
file, it should be ISO at the end.
Dont know if thats any help.
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.DLM is, in fact the extension given to the file by MICROSOFT's download manager (you know , the one that was actually doing the work).
Once the file passes the integrity check, it will automatically be renamed to an .iso file. IF it doesn't pass this, then, of course, it will not.
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.dlm is annextention to the download manager microsoft lets you use for free(how generous of them) you didn't successfuly download it all, though it may be around 3 gigs, its not comppleted, when it is completed it will change itself to .so
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