I have a zip file that contains several mp3 files.
The file has been renamed to Filename.zip.mp3
The file plays using winamp.
I can rename the file and uncompress all the files contained with in the file.
I have tried to re-produce this file using winzip and winrar.
Neither program will let me reproduce this file using the unzipped files.
Is there a way of zipping a bunch of mp3 files,
then renaming the filename.zip to filename.zip.mp3 To re create file that will play in winamp?
Or is there a way to tell what kind of program made this zip file?

If they are in a folder, have you right clicked the folder, clicked send to, compressed folder

With Winrar, right click the folder click add to "folder name.rar"

I have tried it both ways with both WinRar and WinZip
I have compressed the folder and I have compressed all the files within the folder
into a single filename.zip Then I rename the file to filename.zip.mp3
I still get an error message of "Error: Not a valid Mpeg file"

After examination of the orignal zip file I see there are no paths to the files with in the zip
So that eliminates the option of compressing a folder to create the Zip file.
When I try to compress all the single files into a zip file I get the same error message.
I know this can be done. I have several files that work and they have been compressed
in some zip format.

Ok I have found a way to achieve this type of compression. Using WinRar I have changed the Compression method to Store. Then I am able to rename the file to filename.zip.mp3 and the file will play with winamp

Should the file type be the last part of the name

filename.mp3.zip

And does mp3 need to be in the file name as.mp3 instead of filenamemp3.zip

Thanks for posting the workaround

What I did was I put all the mp3's into a folder.
Then I opened up the folder and highlighted all the files with in the folder
THen I right clicked on all the files and selected "Add to Archive" using Winrar.
Then I changed the Compression method from Normal to Store.
After all the files have been compressed into a single zip file
It will have the name of the folder.ZIP I renamed the Folder.Zip to Folder.Zip.Mp3
and I can use winamp to play the file and all of its contents with Winamp
This is an easy solution to storing mp3 files within a zip file and still have access to listen
to the files without unpacking them just to listen to the files.