firefox.exe is not a valid Win32 application

[BigDingus]

Has anyone had this?

"firefox.exe is not a valid Win32 application"

This warning comes up when Dreamweaver needs to open Firefox.

[Nancy OShea]

Are you using a 64-bit computer?

[BigDingus]

I am indeed Nancy

[Nancy OShea]

Edit > Preferences > Real-Time Preview.

Click the plus sign to choose a new browser.

On my system, it's located in Program Files (x86) > Mozilla Firefox > Firefox.exe.

[BigDingus · Accepted solution]

Once again your helpful.

I already had added Firefox to my list.

However, what has fixed it, was removing and reinstalling Firefox.