Combo Box turned into a picture when spreadsheet emailed to user

I distributed an excel file (.xlsm) to many people via email and one emailed me back saying a combo box didn't work.  

When I looked at her file, the combo box had turned into a picture! Any idea what would cause such a thing? Could this be due to a missing ActiveX reference on her machine?
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DavisroBudget AnalystAsked:
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Zac HarrisSystems Administrator Commented:
I've had this happen after applying those amazing things Microsoft swears by (the updates :) )

This often happens also when you create the workbook in one version of Excel and the user opens it in another version.

Try closing Excel on the problem PC and delete the MSForms.exd file from the following places:

C:\Users\[user.name]\AppData\Local\Temp\Excel8.0\MSForms.exd

C:\Users\[user.name]\AppData\Local\Temp\VBE\MSForms.exd

C:\Users\[user.name]\AppData\Local\Temp\Word8.0\MSForms.exd
DavisroBudget AnalystAuthor Commented:
So this template went to many people. So when they open it from email, it opens as an unsaved temporary file. Can I programmatically delete these user files when my file opens, or use an environmental variable to make the Temp file open differently?

I created the file in Excel 2010, but I don't know what version of Excel would cause the temp file to open using these Excel 95 (v.8,0) files.

Would it be anything pre- Excel 2003 or just any version different than 2010?
Zac HarrisSystems Administrator Commented:
Only if they don't already have Excel open and only if its your environment to delete things....IT people are picky like that haha
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DavisroBudget AnalystAuthor Commented:
Turns out this employee opened the file on a Mac using Excel 14.1.0
Rory ArchibaldCommented:
Then ActiveX will never work. Macs don't support it.

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DavisroBudget AnalystAuthor Commented:
Thanks guys
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