Problem adding FMod Lib

[XCoding]

Hello everybody,
I started a project with Serial communication and FMOD. The big problem now is that I have no idea how to solve the compiling error of FMOD : here is my .pro file

QT += core gui serialport
 
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
 
TARGET = Launchpad
TEMPLATE = app
 
DEFINES += QT_DEPRECATED_WARNINGS
 
SOURCES += main.cpp\
        mainwindow.cpp
 
HEADERS  += mainwindow.h
 
INCLUDEPATH += "C:\Program Files (x86)\FMOD SoundSystem\FMOD Studio API Windows\api\lowlevel\inc"
LIBS += "C:\Program Files (x86)\FMOD SoundSystem\FMOD Studio API Windows\api\lowlevel\lib\libfmod.a"

QT += core gui serialport

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = Launchpad
TEMPLATE = app

DEFINES += QT_DEPRECATED_WARNINGS

SOURCES += main.cpp\
        mainwindow.cpp

HEADERS  += mainwindow.h

INCLUDEPATH += "C:\Program Files (x86)\FMOD SoundSystem\FMOD Studio API Windows\api\lowlevel\inc"
LIBS += "C:\Program Files (x86)\FMOD SoundSystem\FMOD Studio API Windows\api\lowlevel\lib\libfmod.a"

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When I try to compile in DEBUG mode, I get an error saying :

collect2.exe: error: ld returned 1 exit status
mingw32-make[1]: *** [debug\Launchpad.exe] Error 1
mingw32-make: *** [debug] Error 2
Makefile.Debug:65: recipe for target 'debug\Launchpad.exe' failed
mingw32-make[1]: Leaving directory 'C:/Users/Ghislaine/Desktop/Thomas/Launchpad/build-Launchpad-Desktop_Qt_5_8_0_MinGW_32bit-Debug'
Makefile:34: recipe for target 'debug' failed
17:50:05: The process "C:\Qt\Tools\mingw530_32\bin\mingw32-make.exe" end with code 2.
Error when compiling/deploying the project Launchpad (kit : Desktop Qt 5.8.0 MinGW 32bit)
When executing step "Make"

I tried a lot of things that I saw on the internet but can't find what's going wrong !
Thanks to all future helpers !

[d_stranz]

In Windows, DLL and link library files are named with extensions ".DLL" and ".LIB", respectively. It looks like you are trying to link to a linux shared library (".a"). Get the library name correct and it will probably work.

[XCoding]

Thank you for the answer but I tried the 3 types of files (.DLL, .LIB & .A) but nothing is working... Still get the same error

Little precision => my compiler is MinGW-32 bits, my computer is 64 bits...
If it can help you.

[d_stranz]

Little precision => my compiler is MinGW-32 bits, my computer is 64 bits...

Then my guess is that you have a 64-bit version of FMod installed. The fact that it appears to be installed to "Program Files (x86)" is a hint. This is usually where 64-bit apps are installed, just the opposite of what you would think. You're going to probably have to find a 32-bit version of FMod and install that, or build the 32-bit libraries if you have source code.