Description
When installing Team Fortress 2, I am unable to select the installation of the game. When the "You are about to install X" window appears, every game except TF2 and TF2 beta has the option to install itself to other mounted disks, while TF2 and TF2 beta completely lack the option. Therefore, TF2 can only be installed to the default installation location.

Reproduce

1. Attempt to Install TF2 from the Library

System Information

Processor Information:
Vendor:  GenuineIntel
Speed: 3426 Mhz
4 logical processors
4 physical processors
HyperThreading:  Unsupported
FCMOV:  Supported
SSE2:  Supported
SSE3:  Supported
SSSE3:  Supported
SSE4a:  Unsupported
SSE41:  Supported
SSE42:  Supported

Network Information:
Network Speed:  

Operating System Version:
Linux (64 bit)
Kernel Name:  Linux
Kernel Version:  3.7.4-1-ck
X Server vendor:  The X.Org Foundation
X Server release:  11302000

Video Card:
Driver:  NVIDIA Corporation GeForce GTX 570/PCIe/SSE2

Driver Version:  4.3.0 NVIDIA 313.18
Desktop Color Depth: 24 bits per pixel
Monitor Refresh Rate: 60 Hz
VendorID:  0x10de
DeviceID:  0x1081
Number of Monitors:  1
Number of Logical Video Cards:  1
Primary Display Resolution:  1920 x 1080
Desktop Resolution: 1920 x 1080
Primary Display Size: 20.08" x 11.30"  (23.03" diag)
                                        51.0cm x 28.7cm  (58.5cm diag)
Primary Bus: PCI Express 16x
Primary VRAM: 1280 MB
Supported MSAA Modes:  2x 4x 8x 16x 

Sound card:
Audio device: USB Mixer

Memory:
RAM:  7975 Mb

Miscellaneous:
UI Language:  English
LANG:  en_US.UTF-8
Microphone:  Not set
Total Hard Disk Space Available:  411724 Mb
Largest Free Hard Disk Block:  220350 Mb

Installed software:

Recent Failure Reports:
Sun Feb  3 20:15:13 2013 GMT: file ''/tmp/dumps/assert_20130203141510_1.dmp'',
upload yes: ''CrashID=bp-89774922-e30f-4ca5-9a49-328dc2130203''
Sun Feb  3 20:36:55 2013 GMT: file ''/tmp/dumps/crash_20130203143650_1.dmp'',
upload yes: ''CrashID=bp-fb769a84-f873-4a83-a085-6a7902130203''